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Refactor madvise(2) configuration.

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Add feature tests for the MADV_FREE and MADV_DONTNEED flags to
madvise(2), so that MADV_FREE is detected and used for Linux kernel
versions 4.5 and newer.  Refactor pages_purge() so that on systems which
support both flags, MADV_FREE is preferred over MADV_DONTNEED.

This resolves #387.
This commit is contained in:
Jason Evans
2016-11-17 10:24:51 -08:00
parent e7ca53bac2
commit 62f2d84e7a
3 changed files with 39 additions and 30 deletions
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21
include/jemalloc/internal/jemalloc_internal_defs.h.in
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@@ -55,11 +55,6 @@
*/
#undef JEMALLOC_HAVE_BUILTIN_CLZ
/*
* Defined if madvise(2) is available.
*/
#undef JEMALLOC_HAVE_MADVISE
/*
* Defined if os_unfair_lock_*() functions are available, as provided by Darwin.
*/
@@ -252,18 +247,20 @@
#undef JEMALLOC_SYSCTL_VM_OVERCOMMIT
#undef JEMALLOC_PROC_SYS_VM_OVERCOMMIT_MEMORY
/* Defined if madvise(2) is available. */
#undef JEMALLOC_HAVE_MADVISE
/*
* Methods for purging unused pages differ between operating systems.
*
* madvise(..., MADV_DONTNEED) : On Linux, this immediately discards pages,
* such that new pages will be demand-zeroed if
* the address region is later touched.
* madvise(..., MADV_FREE) : On FreeBSD and Darwin, this marks pages as being
* unused, such that they will be discarded rather
* than swapped out.
* madvise(..., MADV_FREE) : This marks pages as being unused, such that they
* will be discarded rather than swapped out.
* madvise(..., MADV_DONTNEED) : This immediately discards pages, such that
* new pages will be demand-zeroed if the
* address region is later touched.
*/
#undef JEMALLOC_PURGE_MADVISE_DONTNEED
#undef JEMALLOC_PURGE_MADVISE_FREE
#undef JEMALLOC_PURGE_MADVISE_DONTNEED
/* Define if operating system has alloca.h header. */
#undef JEMALLOC_HAS_ALLOCA_H