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Mac OS: Tag mapped pages.

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This can be used to help profiling tools (e.g. vmmap) identify the
sources of mappings more specifically.
This commit is contained in:
David CARLIER
2021-01-26 21:49:08 +00:00
committed by David Goldblatt
parent f6699803e2
commit 35a8552605
3 changed files with 22 additions and 2 deletions
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9
src/pages.c
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@@ -16,6 +16,11 @@
#ifdef __NetBSD__
#include <sys/bitops.h> /* ilog2 */
#endif
#ifdef JEMALLOC_HAVE_VM_MAKE_TAG
#define PAGES_FD_TAG VM_MAKE_TAG(101U)
#else
#define PAGES_FD_TAG -1
#endif
/******************************************************************************/
/* Data. */
@@ -141,7 +146,7 @@ os_pages_map(void *addr, size_t size, size_t alignment, bool *commit) {
#endif
int prot = *commit ? PAGES_PROT_COMMIT : PAGES_PROT_DECOMMIT;
ret = mmap(addr, size, prot, mmap_flags, -1, 0);
ret = mmap(addr, size, prot, mmap_flags, PAGES_FD_TAG, 0);
}
assert(ret != NULL);
@@ -326,7 +331,7 @@ pages_commit_impl(void *addr, size_t size, bool commit) {
{
int prot = commit ? PAGES_PROT_COMMIT : PAGES_PROT_DECOMMIT;
void *result = mmap(addr, size, prot, mmap_flags | MAP_FIXED,
-1, 0);
PAGES_FD_TAG, 0);
if (result == MAP_FAILED) {
return true;
}