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Implement decay-based unused dirty page purging.

Browse source 
This is an alternative to the existing ratio-based unused dirty page
purging, and is intended to eventually become the sole purging
mechanism.

Add mallctls:
- opt.purge
- opt.decay_time
- arena.<i>.decay
- arena.<i>.decay_time
- arenas.decay_time
- stats.arenas.<i>.decay_time

This resolves #325.
This commit is contained in:
Jason Evans 2016-02-19 20:09:31 -08:00
parent 8e82af1166
commit 243f7a0508
18 changed files with 1268 additions and 112 deletions
Download patch file Download diff file Expand all files Collapse all files

25
src/huge.c
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@ -99,6 +99,7 @@ huge_palloc(tsd_t *tsd, arena_t *arena, size_t size, size_t alignment,
} else if (config_fill && unlikely(opt_junk_alloc))
memset(ret, 0xa5, size);
arena_decay_tick(tsd, arena);
return (ret);
}
@ -280,7 +281,7 @@ huge_ralloc_no_move_expand(void *ptr, size_t oldsize, size_t usize, bool zero) {
}
bool
huge_ralloc_no_move(void *ptr, size_t oldsize, size_t usize_min,
huge_ralloc_no_move(tsd_t *tsd, void *ptr, size_t oldsize, size_t usize_min,
size_t usize_max, bool zero)
{
@ -292,13 +293,18 @@ huge_ralloc_no_move(void *ptr, size_t oldsize, size_t usize_min,
if (CHUNK_CEILING(usize_max) > CHUNK_CEILING(oldsize)) {
/* Attempt to expand the allocation in-place. */
if (!huge_ralloc_no_move_expand(ptr, oldsize, usize_max, zero))
if (!huge_ralloc_no_move_expand(ptr, oldsize, usize_max,
zero)) {
arena_decay_tick(tsd, huge_aalloc(ptr));
return (false);
}
/* Try again, this time with usize_min. */
if (usize_min < usize_max && CHUNK_CEILING(usize_min) >
CHUNK_CEILING(oldsize) && huge_ralloc_no_move_expand(ptr,
oldsize, usize_min, zero))
oldsize, usize_min, zero)) {
arena_decay_tick(tsd, huge_aalloc(ptr));
return (false);
}
}
/*
@ -309,12 +315,17 @@ huge_ralloc_no_move(void *ptr, size_t oldsize, size_t usize_min,
&& CHUNK_CEILING(oldsize) <= CHUNK_CEILING(usize_max)) {
huge_ralloc_no_move_similar(ptr, oldsize, usize_min, usize_max,
zero);
arena_decay_tick(tsd, huge_aalloc(ptr));
return (false);
}
/* Attempt to shrink the allocation in-place. */
if (CHUNK_CEILING(oldsize) > CHUNK_CEILING(usize_max))
return (huge_ralloc_no_move_shrink(ptr, oldsize, usize_max));
if (CHUNK_CEILING(oldsize) > CHUNK_CEILING(usize_max)) {
if (!huge_ralloc_no_move_shrink(ptr, oldsize, usize_max)) {
arena_decay_tick(tsd, huge_aalloc(ptr));
return (false);
}
}
return (true);
}
@ -336,7 +347,7 @@ huge_ralloc(tsd_t *tsd, arena_t *arena, void *ptr, size_t oldsize, size_t usize,
size_t copysize;
/* Try to avoid moving the allocation. */
if (!huge_ralloc_no_move(ptr, oldsize, usize, usize, zero))
if (!huge_ralloc_no_move(tsd, ptr, oldsize, usize, usize, zero))
return (ptr);
/*
@ -373,6 +384,8 @@ huge_dalloc(tsd_t *tsd, void *ptr, tcache_t *tcache)
arena_chunk_dalloc_huge(extent_node_arena_get(node),
extent_node_addr_get(node), extent_node_size_get(node));
idalloctm(tsd, node, tcache, true, true);
arena_decay_tick(tsd, arena);
}
arena_t *