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Implement dynamic per arena control over dirty page purging.

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Add mallctls:
- arenas.lg_dirty_mult is initialized via opt.lg_dirty_mult, and can be
  modified to change the initial lg_dirty_mult setting for newly created
  arenas.
- arena.<i>.lg_dirty_mult controls an individual arena's dirty page
  purging threshold, and synchronously triggers any purging that may be
  necessary to maintain the constraint.
- arena.<i>.chunk.purge allows the per arena dirty page purging function
  to be replaced.

This resolves #93.
This commit is contained in:
Jason Evans
2015-03-18 18:55:33 -07:00
parent c9db461ffb
commit 8d6a3e8321
13 changed files with 460 additions and 99 deletions
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72
test/integration/chunk.c
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@@ -2,13 +2,8 @@
chunk_alloc_t *old_alloc;
chunk_dalloc_t *old_dalloc;
bool
chunk_dalloc(void *chunk, size_t size, unsigned arena_ind)
{
return (old_dalloc(chunk, size, arena_ind));
}
chunk_purge_t *old_purge;
bool purged;
void *
chunk_alloc(void *new_addr, size_t size, size_t alignment, bool *zero,
@@ -18,36 +13,79 @@ chunk_alloc(void *new_addr, size_t size, size_t alignment, bool *zero,
return (old_alloc(new_addr, size, alignment, zero, arena_ind));
}
bool
chunk_dalloc(void *chunk, size_t size, unsigned arena_ind)
{
return (old_dalloc(chunk, size, arena_ind));
}
bool
chunk_purge(void *chunk, size_t offset, size_t length, unsigned arena_ind)
{
purged = true;
return (old_purge(chunk, offset, length, arena_ind));
}
TEST_BEGIN(test_chunk)
{
void *p;
chunk_alloc_t *new_alloc;
chunk_dalloc_t *new_dalloc;
size_t old_size, new_size;
chunk_purge_t *new_purge;
size_t old_size, new_size, huge0, huge1, huge2, sz;
new_alloc = chunk_alloc;
new_dalloc = chunk_dalloc;
new_purge = chunk_purge;
old_size = sizeof(chunk_alloc_t *);
new_size = sizeof(chunk_alloc_t *);
assert_d_eq(mallctl("arena.0.chunk.alloc", &old_alloc,
&old_size, &new_alloc, new_size), 0,
"Unexpected alloc error");
assert_ptr_ne(old_alloc, new_alloc,
"Unexpected alloc error");
assert_d_eq(mallctl("arena.0.chunk.alloc", &old_alloc, &old_size,
&new_alloc, new_size), 0, "Unexpected alloc error");
assert_ptr_ne(old_alloc, new_alloc, "Unexpected alloc error");
assert_d_eq(mallctl("arena.0.chunk.dalloc", &old_dalloc, &old_size,
&new_dalloc, new_size), 0, "Unexpected dalloc error");
assert_ptr_ne(old_dalloc, new_dalloc, "Unexpected dalloc error");
assert_d_eq(mallctl("arena.0.chunk.purge", &old_purge, &old_size,
&new_purge, new_size), 0, "Unexpected purge error");
assert_ptr_ne(old_purge, new_purge, "Unexpected purge error");
sz = sizeof(size_t);
assert_d_eq(mallctl("arenas.hchunk.0.size", &huge0, &sz, NULL, 0), 0,
"Unexpected arenas.hchunk.0.size failure");
assert_d_eq(mallctl("arenas.hchunk.1.size", &huge1, &sz, NULL, 0), 0,
"Unexpected arenas.hchunk.1.size failure");
assert_d_eq(mallctl("arenas.hchunk.2.size", &huge2, &sz, NULL, 0), 0,
"Unexpected arenas.hchunk.2.size failure");
if (huge0 * 2 > huge2) {
/*
* There are at least four size classes per doubling, so
* xallocx() from size=huge2 to size=huge1 is guaranteed to
* leave trailing purgeable memory.
*/
p = mallocx(huge2, 0);
assert_ptr_not_null(p, "Unexpected mallocx() error");
purged = false;
assert_zu_eq(xallocx(p, huge1, 0, 0), huge1,
"Unexpected xallocx() failure");
assert_true(purged, "Unexpected purge");
dallocx(p, 0);
}
p = mallocx(42, 0);
assert_ptr_ne(p, NULL, "Unexpected alloc error");
assert_ptr_not_null(p, "Unexpected mallocx() error");
free(p);
assert_d_eq(mallctl("arena.0.chunk.alloc", NULL,
NULL, &old_alloc, old_size), 0,
"Unexpected alloc error");
assert_d_eq(mallctl("arena.0.chunk.alloc", NULL, NULL, &old_alloc,
old_size), 0, "Unexpected alloc error");
assert_d_eq(mallctl("arena.0.chunk.dalloc", NULL, NULL, &old_dalloc,
old_size), 0, "Unexpected dalloc error");
assert_d_eq(mallctl("arena.0.chunk.purge", NULL, NULL, &old_purge,
old_size), 0, "Unexpected purge error");
}
TEST_END