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Fix pages_purge_forced() to discard pages on non-Linux systems.

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madvise(..., MADV_DONTNEED) only causes demand-zeroing on Linux, so fall
back to overlaying a new mapping.
This commit is contained in:
Jason Evans
2017-03-09 18:20:02 -08:00
parent 21a68e2d22
commit 7cbcd2e2b7
4 changed files with 21 additions and 5 deletions
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11
include/jemalloc/internal/jemalloc_internal_defs.h.in
View File

@@ -265,12 +265,17 @@
*
* 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.
* madvise(..., MADV_DONTNEED) : If JEMALLOC_PURGE_MADVISE_DONTNEED_ZEROS is
* defined, this immediately discards pages,
* such that new pages will be demand-zeroed if
* the address region is later touched;
* otherwise this behaves similarly to
* MADV_FREE, though typically with higher
* system overhead.
*/
#undef JEMALLOC_PURGE_MADVISE_FREE
#undef JEMALLOC_PURGE_MADVISE_DONTNEED
#undef JEMALLOC_PURGE_MADVISE_DONTNEED_ZEROS
/*
* Defined if transparent huge pages are supported via the MADV_[NO]HUGEPAGE

4
include/jemalloc/internal/pages_types.h
View File

@@ -37,7 +37,9 @@
* next step after purging on Windows anyway, there's no point in adding such
* complexity.
*/
#if !defined(_WIN32) && defined(JEMALLOC_PURGE_MADVISE_DONTNEED)
#if !defined(_WIN32) && ((defined(JEMALLOC_PURGE_MADVISE_DONTNEED) && \
defined(JEMALLOC_PURGE_MADVISE_DONTNEED_ZEROS)) || \
defined(JEMALLOC_MAPS_COALESCE))
# define PAGES_CAN_PURGE_FORCED
#endif