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Refactor purging and splitting/merging.

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Split purging into lazy and forced variants.  Use the forced variant for
zeroing dss.

Add support for NULL function pointers as an opt-out mechanism for the
dalloc, commit, decommit, purge_lazy, purge_forced, split, and merge
fields of extent_hooks_t.

Add short-circuiting checks in large_ralloc_no_move_{shrink,expand}() so
that no attempt is made if splitting/merging is not supported.

This resolves #268.
This commit is contained in:
Jason Evans 2016-12-03 15:38:25 -08:00
parent 884fa22b8c
commit a6e86810d8
11 changed files with 258 additions and 84 deletions
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43
src/pages.c
View file

@ -163,33 +163,34 @@ pages_decommit(void *addr, size_t size)
}
bool
pages_purge(void *addr, size_t size)
pages_purge_lazy(void *addr, size_t size)
{
bool unzeroed;
if (!pages_can_purge_lazy)
return (true);
#ifdef _WIN32
VirtualAlloc(addr, size, MEM_RESET, PAGE_READWRITE);
unzeroed = true;
#elif (defined(JEMALLOC_PURGE_MADVISE_FREE) || \
defined(JEMALLOC_PURGE_MADVISE_DONTNEED))
# if defined(JEMALLOC_PURGE_MADVISE_FREE)
# define JEMALLOC_MADV_PURGE MADV_FREE
# define JEMALLOC_MADV_ZEROS false
# elif defined(JEMALLOC_PURGE_MADVISE_DONTNEED)
# define JEMALLOC_MADV_PURGE MADV_DONTNEED
# define JEMALLOC_MADV_ZEROS true
# else
# error No madvise(2) flag defined for purging unused dirty pages
# endif
int err = madvise(addr, size, JEMALLOC_MADV_PURGE);
unzeroed = (!JEMALLOC_MADV_ZEROS || err != 0);
# undef JEMALLOC_MADV_PURGE
# undef JEMALLOC_MADV_ZEROS
#elif defined(JEMALLOC_PURGE_MADVISE_FREE)
madvise(addr, size, MADV_FREE);
#else
/* Last resort no-op. */
unzeroed = true;
not_reached();
#endif
return (false);
}
bool
pages_purge_forced(void *addr, size_t size)
{
if (!pages_can_purge_forced)
return (true);
#if defined(JEMALLOC_PURGE_MADVISE_DONTNEED)
return (madvise(addr, size, MADV_DONTNEED) != 0);
#else
not_reached();
#endif
return (unzeroed);
}
bool