650 lines
15 KiB
C
650 lines
15 KiB
C
#define JEMALLOC_PAGES_C_
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#include "jemalloc/internal/jemalloc_preamble.h"
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#include "jemalloc/internal/pages.h"
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#include "jemalloc/internal/jemalloc_internal_includes.h"
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#include "jemalloc/internal/assert.h"
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#include "jemalloc/internal/malloc_io.h"
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#ifdef JEMALLOC_SYSCTL_VM_OVERCOMMIT
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#include <sys/sysctl.h>
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#ifdef __FreeBSD__
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#include <vm/vm_param.h>
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#endif
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#endif
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/******************************************************************************/
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/* Data. */
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/* Actual operating system page size, detected during bootstrap, <= PAGE. */
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static size_t os_page;
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#ifndef _WIN32
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# define PAGES_PROT_COMMIT (PROT_READ | PROT_WRITE)
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# define PAGES_PROT_DECOMMIT (PROT_NONE)
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static int mmap_flags;
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#endif
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static bool os_overcommits;
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const char *thp_mode_names[] = {
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"default",
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"always",
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"never",
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"not supported"
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};
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thp_mode_t opt_thp = THP_MODE_DEFAULT;
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thp_mode_t init_system_thp_mode;
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/* Runtime support for lazy purge. Irrelevant when !pages_can_purge_lazy. */
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static bool pages_can_purge_lazy_runtime = true;
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/******************************************************************************/
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/*
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* Function prototypes for static functions that are referenced prior to
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* definition.
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*/
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static void os_pages_unmap(void *addr, size_t size);
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/******************************************************************************/
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static void *
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os_pages_map(void *addr, size_t size, size_t alignment, bool *commit) {
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assert(ALIGNMENT_ADDR2BASE(addr, os_page) == addr);
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assert(ALIGNMENT_CEILING(size, os_page) == size);
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assert(size != 0);
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if (os_overcommits) {
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*commit = true;
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}
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void *ret;
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#ifdef _WIN32
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/*
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* If VirtualAlloc can't allocate at the given address when one is
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* given, it fails and returns NULL.
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*/
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ret = VirtualAlloc(addr, size, MEM_RESERVE | (*commit ? MEM_COMMIT : 0),
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PAGE_READWRITE);
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#else
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/*
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* We don't use MAP_FIXED here, because it can cause the *replacement*
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* of existing mappings, and we only want to create new mappings.
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*/
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{
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int prot = *commit ? PAGES_PROT_COMMIT : PAGES_PROT_DECOMMIT;
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ret = mmap(addr, size, prot, mmap_flags, -1, 0);
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}
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assert(ret != NULL);
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if (ret == MAP_FAILED) {
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ret = NULL;
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} else if (addr != NULL && ret != addr) {
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/*
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* We succeeded in mapping memory, but not in the right place.
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*/
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os_pages_unmap(ret, size);
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ret = NULL;
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}
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#endif
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assert(ret == NULL || (addr == NULL && ret != addr) || (addr != NULL &&
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ret == addr));
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return ret;
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}
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static void *
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os_pages_trim(void *addr, size_t alloc_size, size_t leadsize, size_t size,
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bool *commit) {
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void *ret = (void *)((uintptr_t)addr + leadsize);
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assert(alloc_size >= leadsize + size);
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#ifdef _WIN32
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os_pages_unmap(addr, alloc_size);
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void *new_addr = os_pages_map(ret, size, PAGE, commit);
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if (new_addr == ret) {
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return ret;
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}
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if (new_addr != NULL) {
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os_pages_unmap(new_addr, size);
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}
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return NULL;
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#else
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size_t trailsize = alloc_size - leadsize - size;
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if (leadsize != 0) {
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os_pages_unmap(addr, leadsize);
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}
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if (trailsize != 0) {
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os_pages_unmap((void *)((uintptr_t)ret + size), trailsize);
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}
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return ret;
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#endif
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}
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static void
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os_pages_unmap(void *addr, size_t size) {
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assert(ALIGNMENT_ADDR2BASE(addr, os_page) == addr);
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assert(ALIGNMENT_CEILING(size, os_page) == size);
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#ifdef _WIN32
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if (VirtualFree(addr, 0, MEM_RELEASE) == 0)
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#else
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if (munmap(addr, size) == -1)
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#endif
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{
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char buf[BUFERROR_BUF];
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buferror(get_errno(), buf, sizeof(buf));
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malloc_printf("<jemalloc>: Error in "
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#ifdef _WIN32
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"VirtualFree"
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#else
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"munmap"
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#endif
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"(): %s\n", buf);
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if (opt_abort) {
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abort();
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}
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}
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}
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static void *
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pages_map_slow(size_t size, size_t alignment, bool *commit) {
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size_t alloc_size = size + alignment - os_page;
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/* Beware size_t wrap-around. */
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if (alloc_size < size) {
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return NULL;
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}
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void *ret;
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do {
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void *pages = os_pages_map(NULL, alloc_size, alignment, commit);
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if (pages == NULL) {
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return NULL;
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}
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size_t leadsize = ALIGNMENT_CEILING((uintptr_t)pages, alignment)
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- (uintptr_t)pages;
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ret = os_pages_trim(pages, alloc_size, leadsize, size, commit);
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} while (ret == NULL);
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assert(ret != NULL);
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assert(PAGE_ADDR2BASE(ret) == ret);
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return ret;
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}
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void *
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pages_map(void *addr, size_t size, size_t alignment, bool *commit) {
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assert(alignment >= PAGE);
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assert(ALIGNMENT_ADDR2BASE(addr, alignment) == addr);
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#if defined(__FreeBSD__) && defined(MAP_EXCL)
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/*
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* FreeBSD has mechanisms both to mmap at specific address without
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* touching existing mappings, and to mmap with specific alignment.
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*/
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{
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if (os_overcommits) {
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*commit = true;
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}
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int prot = *commit ? PAGES_PROT_COMMIT : PAGES_PROT_DECOMMIT;
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int flags = mmap_flags;
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if (addr != NULL) {
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flags |= MAP_FIXED | MAP_EXCL;
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} else {
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unsigned alignment_bits = ffs_zu(alignment);
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assert(alignment_bits > 1);
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flags |= MAP_ALIGNED(alignment_bits - 1);
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}
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void *ret = mmap(addr, size, prot, flags, -1, 0);
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if (ret == MAP_FAILED) {
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ret = NULL;
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}
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return ret;
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}
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#endif
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/*
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* Ideally, there would be a way to specify alignment to mmap() (like
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* NetBSD has), but in the absence of such a feature, we have to work
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* hard to efficiently create aligned mappings. The reliable, but
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* slow method is to create a mapping that is over-sized, then trim the
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* excess. However, that always results in one or two calls to
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* os_pages_unmap(), and it can leave holes in the process's virtual
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* memory map if memory grows downward.
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*
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* Optimistically try mapping precisely the right amount before falling
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* back to the slow method, with the expectation that the optimistic
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* approach works most of the time.
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*/
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void *ret = os_pages_map(addr, size, os_page, commit);
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if (ret == NULL || ret == addr) {
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return ret;
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}
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assert(addr == NULL);
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if (ALIGNMENT_ADDR2OFFSET(ret, alignment) != 0) {
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os_pages_unmap(ret, size);
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return pages_map_slow(size, alignment, commit);
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}
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assert(PAGE_ADDR2BASE(ret) == ret);
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return ret;
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}
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void
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pages_unmap(void *addr, size_t size) {
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assert(PAGE_ADDR2BASE(addr) == addr);
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assert(PAGE_CEILING(size) == size);
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os_pages_unmap(addr, size);
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}
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static bool
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pages_commit_impl(void *addr, size_t size, bool commit) {
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assert(PAGE_ADDR2BASE(addr) == addr);
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assert(PAGE_CEILING(size) == size);
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if (os_overcommits) {
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return true;
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}
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#ifdef _WIN32
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return (commit ? (addr != VirtualAlloc(addr, size, MEM_COMMIT,
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PAGE_READWRITE)) : (!VirtualFree(addr, size, MEM_DECOMMIT)));
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#else
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{
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int prot = commit ? PAGES_PROT_COMMIT : PAGES_PROT_DECOMMIT;
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void *result = mmap(addr, size, prot, mmap_flags | MAP_FIXED,
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-1, 0);
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if (result == MAP_FAILED) {
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return true;
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}
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if (result != addr) {
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/*
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* We succeeded in mapping memory, but not in the right
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* place.
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*/
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os_pages_unmap(result, size);
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return true;
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}
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return false;
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}
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#endif
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}
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bool
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pages_commit(void *addr, size_t size) {
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return pages_commit_impl(addr, size, true);
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}
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bool
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pages_decommit(void *addr, size_t size) {
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return pages_commit_impl(addr, size, false);
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}
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bool
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pages_purge_lazy(void *addr, size_t size) {
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assert(ALIGNMENT_ADDR2BASE(addr, os_page) == addr);
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assert(PAGE_CEILING(size) == size);
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if (!pages_can_purge_lazy) {
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return true;
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}
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if (!pages_can_purge_lazy_runtime) {
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/*
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* Built with lazy purge enabled, but detected it was not
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* supported on the current system.
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*/
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return true;
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}
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#ifdef _WIN32
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VirtualAlloc(addr, size, MEM_RESET, PAGE_READWRITE);
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return false;
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#elif defined(JEMALLOC_PURGE_MADVISE_FREE)
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return (madvise(addr, size,
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# ifdef MADV_FREE
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MADV_FREE
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# else
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JEMALLOC_MADV_FREE
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# endif
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) != 0);
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#elif defined(JEMALLOC_PURGE_MADVISE_DONTNEED) && \
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!defined(JEMALLOC_PURGE_MADVISE_DONTNEED_ZEROS)
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return (madvise(addr, size, MADV_DONTNEED) != 0);
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#else
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not_reached();
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#endif
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}
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bool
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pages_purge_forced(void *addr, size_t size) {
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assert(PAGE_ADDR2BASE(addr) == addr);
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assert(PAGE_CEILING(size) == size);
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if (!pages_can_purge_forced) {
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return true;
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}
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#if defined(JEMALLOC_PURGE_MADVISE_DONTNEED) && \
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defined(JEMALLOC_PURGE_MADVISE_DONTNEED_ZEROS)
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return (madvise(addr, size, MADV_DONTNEED) != 0);
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#elif defined(JEMALLOC_MAPS_COALESCE)
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/* Try to overlay a new demand-zeroed mapping. */
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return pages_commit(addr, size);
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#else
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not_reached();
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#endif
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}
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static bool
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pages_huge_impl(void *addr, size_t size, bool aligned) {
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if (aligned) {
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assert(HUGEPAGE_ADDR2BASE(addr) == addr);
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assert(HUGEPAGE_CEILING(size) == size);
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}
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#ifdef JEMALLOC_HAVE_MADVISE_HUGE
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return (madvise(addr, size, MADV_HUGEPAGE) != 0);
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#else
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return true;
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#endif
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}
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bool
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pages_huge(void *addr, size_t size) {
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return pages_huge_impl(addr, size, true);
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}
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static bool
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pages_huge_unaligned(void *addr, size_t size) {
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return pages_huge_impl(addr, size, false);
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}
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static bool
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pages_nohuge_impl(void *addr, size_t size, bool aligned) {
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if (aligned) {
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assert(HUGEPAGE_ADDR2BASE(addr) == addr);
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assert(HUGEPAGE_CEILING(size) == size);
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}
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#ifdef JEMALLOC_HAVE_MADVISE_HUGE
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return (madvise(addr, size, MADV_NOHUGEPAGE) != 0);
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#else
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return false;
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#endif
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}
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bool
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pages_nohuge(void *addr, size_t size) {
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return pages_nohuge_impl(addr, size, true);
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}
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static bool
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pages_nohuge_unaligned(void *addr, size_t size) {
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return pages_nohuge_impl(addr, size, false);
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}
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bool
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pages_dontdump(void *addr, size_t size) {
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assert(PAGE_ADDR2BASE(addr) == addr);
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assert(PAGE_CEILING(size) == size);
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#ifdef JEMALLOC_MADVISE_DONTDUMP
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return madvise(addr, size, MADV_DONTDUMP) != 0;
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#else
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return false;
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#endif
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}
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bool
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pages_dodump(void *addr, size_t size) {
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assert(PAGE_ADDR2BASE(addr) == addr);
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assert(PAGE_CEILING(size) == size);
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#ifdef JEMALLOC_MADVISE_DONTDUMP
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return madvise(addr, size, MADV_DODUMP) != 0;
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#else
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return false;
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#endif
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}
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static size_t
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os_page_detect(void) {
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#ifdef _WIN32
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SYSTEM_INFO si;
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GetSystemInfo(&si);
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return si.dwPageSize;
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#elif defined(__FreeBSD__)
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/*
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* This returns the value obtained from
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* the auxv vector, avoiding a syscall.
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*/
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return getpagesize();
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#else
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long result = sysconf(_SC_PAGESIZE);
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if (result == -1) {
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return LG_PAGE;
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}
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return (size_t)result;
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#endif
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}
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#ifdef JEMALLOC_SYSCTL_VM_OVERCOMMIT
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static bool
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os_overcommits_sysctl(void) {
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int vm_overcommit;
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size_t sz;
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sz = sizeof(vm_overcommit);
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#if defined(__FreeBSD__) && defined(VM_OVERCOMMIT)
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int mib[2];
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mib[0] = CTL_VM;
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mib[1] = VM_OVERCOMMIT;
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if (sysctl(mib, 2, &vm_overcommit, &sz, NULL, 0) != 0) {
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return false; /* Error. */
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}
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#else
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if (sysctlbyname("vm.overcommit", &vm_overcommit, &sz, NULL, 0) != 0) {
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return false; /* Error. */
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}
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#endif
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return ((vm_overcommit & 0x3) == 0);
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}
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#endif
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#ifdef JEMALLOC_PROC_SYS_VM_OVERCOMMIT_MEMORY
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/*
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* Use syscall(2) rather than {open,read,close}(2) when possible to avoid
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* reentry during bootstrapping if another library has interposed system call
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* wrappers.
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*/
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static bool
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os_overcommits_proc(void) {
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int fd;
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char buf[1];
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#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_open)
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#if defined(O_CLOEXEC)
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fd = (int)syscall(SYS_open, "/proc/sys/vm/overcommit_memory", O_RDONLY |
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O_CLOEXEC);
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#else
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fd = (int)syscall(SYS_open, "/proc/sys/vm/overcommit_memory", O_RDONLY);
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if (fd != -1) {
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fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
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}
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#endif
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#elif defined(JEMALLOC_USE_SYSCALL) && defined(SYS_openat)
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#if defined(O_CLOEXEC)
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fd = (int)syscall(SYS_openat,
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AT_FDCWD, "/proc/sys/vm/overcommit_memory", O_RDONLY | O_CLOEXEC);
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#else
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fd = (int)syscall(SYS_openat,
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AT_FDCWD, "/proc/sys/vm/overcommit_memory", O_RDONLY);
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if (fd != -1) {
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fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
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}
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#endif
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#else
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#if defined(O_CLOEXEC)
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fd = open("/proc/sys/vm/overcommit_memory", O_RDONLY | O_CLOEXEC);
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#else
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fd = open("/proc/sys/vm/overcommit_memory", O_RDONLY);
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if (fd != -1) {
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fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
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}
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#endif
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#endif
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if (fd == -1) {
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return false; /* Error. */
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}
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ssize_t nread = malloc_read_fd(fd, &buf, sizeof(buf));
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#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_close)
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syscall(SYS_close, fd);
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#else
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close(fd);
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#endif
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if (nread < 1) {
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return false; /* Error. */
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}
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/*
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* /proc/sys/vm/overcommit_memory meanings:
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* 0: Heuristic overcommit.
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* 1: Always overcommit.
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* 2: Never overcommit.
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*/
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return (buf[0] == '0' || buf[0] == '1');
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}
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#endif
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void
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pages_set_thp_state (void *ptr, size_t size) {
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if (opt_thp == thp_mode_default || opt_thp == init_system_thp_mode) {
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return;
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}
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assert(opt_thp != thp_mode_not_supported &&
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init_system_thp_mode != thp_mode_not_supported);
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|
|
if (opt_thp == thp_mode_always
|
|
&& init_system_thp_mode != thp_mode_never) {
|
|
assert(init_system_thp_mode == thp_mode_default);
|
|
pages_huge_unaligned(ptr, size);
|
|
} else if (opt_thp == thp_mode_never) {
|
|
assert(init_system_thp_mode == thp_mode_default ||
|
|
init_system_thp_mode == thp_mode_always);
|
|
pages_nohuge_unaligned(ptr, size);
|
|
}
|
|
}
|
|
|
|
static void
|
|
init_thp_state(void) {
|
|
if (!have_madvise_huge) {
|
|
if (metadata_thp_enabled() && opt_abort) {
|
|
malloc_write("<jemalloc>: no MADV_HUGEPAGE support\n");
|
|
abort();
|
|
}
|
|
goto label_error;
|
|
}
|
|
|
|
static const char sys_state_madvise[] = "always [madvise] never\n";
|
|
static const char sys_state_always[] = "[always] madvise never\n";
|
|
static const char sys_state_never[] = "always madvise [never]\n";
|
|
char buf[sizeof(sys_state_madvise)];
|
|
|
|
#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_open)
|
|
int fd = (int)syscall(SYS_open,
|
|
"/sys/kernel/mm/transparent_hugepage/enabled", O_RDONLY);
|
|
#else
|
|
int fd = open("/sys/kernel/mm/transparent_hugepage/enabled", O_RDONLY);
|
|
#endif
|
|
if (fd == -1) {
|
|
goto label_error;
|
|
}
|
|
|
|
ssize_t nread = malloc_read_fd(fd, &buf, sizeof(buf));
|
|
#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_close)
|
|
syscall(SYS_close, fd);
|
|
#else
|
|
close(fd);
|
|
#endif
|
|
|
|
if (nread < 0) {
|
|
goto label_error;
|
|
}
|
|
|
|
if (strncmp(buf, sys_state_madvise, (size_t)nread) == 0) {
|
|
init_system_thp_mode = thp_mode_default;
|
|
} else if (strncmp(buf, sys_state_always, (size_t)nread) == 0) {
|
|
init_system_thp_mode = thp_mode_always;
|
|
} else if (strncmp(buf, sys_state_never, (size_t)nread) == 0) {
|
|
init_system_thp_mode = thp_mode_never;
|
|
} else {
|
|
goto label_error;
|
|
}
|
|
return;
|
|
label_error:
|
|
opt_thp = init_system_thp_mode = thp_mode_not_supported;
|
|
}
|
|
|
|
bool
|
|
pages_boot(void) {
|
|
os_page = os_page_detect();
|
|
if (os_page > PAGE) {
|
|
malloc_write("<jemalloc>: Unsupported system page size\n");
|
|
if (opt_abort) {
|
|
abort();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
mmap_flags = MAP_PRIVATE | MAP_ANON;
|
|
#endif
|
|
|
|
#ifdef JEMALLOC_SYSCTL_VM_OVERCOMMIT
|
|
os_overcommits = os_overcommits_sysctl();
|
|
#elif defined(JEMALLOC_PROC_SYS_VM_OVERCOMMIT_MEMORY)
|
|
os_overcommits = os_overcommits_proc();
|
|
# ifdef MAP_NORESERVE
|
|
if (os_overcommits) {
|
|
mmap_flags |= MAP_NORESERVE;
|
|
}
|
|
# endif
|
|
#else
|
|
os_overcommits = false;
|
|
#endif
|
|
|
|
init_thp_state();
|
|
|
|
#ifdef __FreeBSD__
|
|
/*
|
|
* FreeBSD doesn't need the check; madvise(2) is known to work.
|
|
*/
|
|
#else
|
|
/* Detect lazy purge runtime support. */
|
|
if (pages_can_purge_lazy) {
|
|
bool committed = false;
|
|
void *madv_free_page = os_pages_map(NULL, PAGE, PAGE, &committed);
|
|
if (madv_free_page == NULL) {
|
|
return true;
|
|
}
|
|
assert(pages_can_purge_lazy_runtime);
|
|
if (pages_purge_lazy(madv_free_page, PAGE)) {
|
|
pages_can_purge_lazy_runtime = false;
|
|
}
|
|
os_pages_unmap(madv_free_page, PAGE);
|
|
}
|
|
#endif
|
|
|
|
return false;
|
|
}
|