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Implement decay-based unused dirty page purging.

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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
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95
test/unit/mallctl.c
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@@ -164,7 +164,9 @@ TEST_BEGIN(test_mallctl_opt)
TEST_MALLCTL_OPT(size_t, lg_chunk, always);
TEST_MALLCTL_OPT(const char *, dss, always);
TEST_MALLCTL_OPT(size_t, narenas, always);
TEST_MALLCTL_OPT(const char *, purge, always);
TEST_MALLCTL_OPT(ssize_t, lg_dirty_mult, always);
TEST_MALLCTL_OPT(ssize_t, decay_time, always);
TEST_MALLCTL_OPT(bool, stats_print, always);
TEST_MALLCTL_OPT(const char *, junk, fill);
TEST_MALLCTL_OPT(size_t, quarantine, fill);
@@ -355,6 +357,8 @@ TEST_BEGIN(test_arena_i_lg_dirty_mult)
ssize_t lg_dirty_mult, orig_lg_dirty_mult, prev_lg_dirty_mult;
size_t sz = sizeof(ssize_t);
test_skip_if(opt_purge != purge_mode_ratio);
assert_d_eq(mallctl("arena.0.lg_dirty_mult", &orig_lg_dirty_mult, &sz,
NULL, 0), 0, "Unexpected mallctl() failure");
@@ -382,6 +386,39 @@ TEST_BEGIN(test_arena_i_lg_dirty_mult)
}
TEST_END
TEST_BEGIN(test_arena_i_decay_time)
{
ssize_t decay_time, orig_decay_time, prev_decay_time;
size_t sz = sizeof(ssize_t);
test_skip_if(opt_purge != purge_mode_decay);
assert_d_eq(mallctl("arena.0.decay_time", &orig_decay_time, &sz,
NULL, 0), 0, "Unexpected mallctl() failure");
decay_time = -2;
assert_d_eq(mallctl("arena.0.decay_time", NULL, NULL,
&decay_time, sizeof(ssize_t)), EFAULT,
"Unexpected mallctl() success");
decay_time = TIME_SEC_MAX;
assert_d_eq(mallctl("arena.0.decay_time", NULL, NULL,
&decay_time, sizeof(ssize_t)), 0,
"Unexpected mallctl() failure");
for (prev_decay_time = decay_time, decay_time = -1;
decay_time < 20; prev_decay_time = decay_time, decay_time++) {
ssize_t old_decay_time;
assert_d_eq(mallctl("arena.0.decay_time", &old_decay_time,
&sz, &decay_time, sizeof(ssize_t)), 0,
"Unexpected mallctl() failure");
assert_zd_eq(old_decay_time, prev_decay_time,
"Unexpected old arena.0.decay_time");
}
}
TEST_END
TEST_BEGIN(test_arena_i_purge)
{
unsigned narenas;
@@ -402,6 +439,26 @@ TEST_BEGIN(test_arena_i_purge)
}
TEST_END
TEST_BEGIN(test_arena_i_decay)
{
unsigned narenas;
size_t sz = sizeof(unsigned);
size_t mib[3];
size_t miblen = 3;
assert_d_eq(mallctl("arena.0.decay", NULL, NULL, NULL, 0), 0,
"Unexpected mallctl() failure");
assert_d_eq(mallctl("arenas.narenas", &narenas, &sz, NULL, 0), 0,
"Unexpected mallctl() failure");
assert_d_eq(mallctlnametomib("arena.0.decay", mib, &miblen), 0,
"Unexpected mallctlnametomib() failure");
mib[1] = narenas;
assert_d_eq(mallctlbymib(mib, miblen, NULL, NULL, NULL, 0), 0,
"Unexpected mallctlbymib() failure");
}
TEST_END
TEST_BEGIN(test_arena_i_dss)
{
const char *dss_prec_old, *dss_prec_new;
@@ -466,6 +523,8 @@ TEST_BEGIN(test_arenas_lg_dirty_mult)
ssize_t lg_dirty_mult, orig_lg_dirty_mult, prev_lg_dirty_mult;
size_t sz = sizeof(ssize_t);
test_skip_if(opt_purge != purge_mode_ratio);
assert_d_eq(mallctl("arenas.lg_dirty_mult", &orig_lg_dirty_mult, &sz,
NULL, 0), 0, "Unexpected mallctl() failure");
@@ -493,6 +552,39 @@ TEST_BEGIN(test_arenas_lg_dirty_mult)
}
TEST_END
TEST_BEGIN(test_arenas_decay_time)
{
ssize_t decay_time, orig_decay_time, prev_decay_time;
size_t sz = sizeof(ssize_t);
test_skip_if(opt_purge != purge_mode_decay);
assert_d_eq(mallctl("arenas.decay_time", &orig_decay_time, &sz,
NULL, 0), 0, "Unexpected mallctl() failure");
decay_time = -2;
assert_d_eq(mallctl("arenas.decay_time", NULL, NULL,
&decay_time, sizeof(ssize_t)), EFAULT,
"Unexpected mallctl() success");
decay_time = TIME_SEC_MAX;
assert_d_eq(mallctl("arenas.decay_time", NULL, NULL,
&decay_time, sizeof(ssize_t)), 0,
"Expected mallctl() failure");
for (prev_decay_time = decay_time, decay_time = -1;
decay_time < 20; prev_decay_time = decay_time, decay_time++) {
ssize_t old_decay_time;
assert_d_eq(mallctl("arenas.decay_time", &old_decay_time,
&sz, &decay_time, sizeof(ssize_t)), 0,
"Unexpected mallctl() failure");
assert_zd_eq(old_decay_time, prev_decay_time,
"Unexpected old arenas.decay_time");
}
}
TEST_END
TEST_BEGIN(test_arenas_constants)
{
@@ -621,10 +713,13 @@ main(void)
test_tcache,
test_thread_arena,
test_arena_i_lg_dirty_mult,
test_arena_i_decay_time,
test_arena_i_purge,
test_arena_i_decay,
test_arena_i_dss,
test_arenas_initialized,
test_arenas_lg_dirty_mult,
test_arenas_decay_time,
test_arenas_constants,
test_arenas_bin_constants,
test_arenas_lrun_constants,