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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

60
src/stats.c
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@@ -258,7 +258,7 @@ stats_arena_print(void (*write_cb)(void *, const char *), void *cbopaque,
{
unsigned nthreads;
const char *dss;
ssize_t lg_dirty_mult;
ssize_t lg_dirty_mult, decay_time;
size_t page, pactive, pdirty, mapped;
size_t metadata_mapped, metadata_allocated;
uint64_t npurge, nmadvise, purged;
@@ -278,13 +278,23 @@ stats_arena_print(void (*write_cb)(void *, const char *), void *cbopaque,
malloc_cprintf(write_cb, cbopaque, "dss allocation precedence: %s\n",
dss);
CTL_M2_GET("stats.arenas.0.lg_dirty_mult", i, &lg_dirty_mult, ssize_t);
if (lg_dirty_mult >= 0) {
malloc_cprintf(write_cb, cbopaque,
"min active:dirty page ratio: %u:1\n",
(1U << lg_dirty_mult));
} else {
malloc_cprintf(write_cb, cbopaque,
"min active:dirty page ratio: N/A\n");
if (opt_purge == purge_mode_ratio) {
if (lg_dirty_mult >= 0) {
malloc_cprintf(write_cb, cbopaque,
"min active:dirty page ratio: %u:1\n",
(1U << lg_dirty_mult));
} else {
malloc_cprintf(write_cb, cbopaque,
"min active:dirty page ratio: N/A\n");
}
}
CTL_M2_GET("stats.arenas.0.decay_time", i, &decay_time, ssize_t);
if (opt_purge == purge_mode_decay) {
if (decay_time >= 0) {
malloc_cprintf(write_cb, cbopaque, "decay time: %zd\n",
decay_time);
} else
malloc_cprintf(write_cb, cbopaque, "decay time: N/A\n");
}
CTL_M2_GET("stats.arenas.0.pactive", i, &pactive, size_t);
CTL_M2_GET("stats.arenas.0.pdirty", i, &pdirty, size_t);
@@ -292,9 +302,8 @@ stats_arena_print(void (*write_cb)(void *, const char *), void *cbopaque,
CTL_M2_GET("stats.arenas.0.nmadvise", i, &nmadvise, uint64_t);
CTL_M2_GET("stats.arenas.0.purged", i, &purged, uint64_t);
malloc_cprintf(write_cb, cbopaque,
"dirty pages: %zu:%zu active:dirty, %"FMTu64" sweep%s, %"FMTu64
" madvise%s, %"FMTu64" purged\n", pactive, pdirty, npurge, npurge ==
1 ? "" : "s", nmadvise, nmadvise == 1 ? "" : "s", purged);
"purging: dirty: %zu, sweeps: %"FMTu64", madvises: %"FMTu64", "
"purged: %"FMTu64"\n", pdirty, npurge, nmadvise, purged);
malloc_cprintf(write_cb, cbopaque,
" allocated nmalloc ndalloc"
@@ -486,7 +495,13 @@ stats_print(void (*write_cb)(void *, const char *), void *cbopaque,
OPT_WRITE_SIZE_T(lg_chunk)
OPT_WRITE_CHAR_P(dss)
OPT_WRITE_SIZE_T(narenas)
OPT_WRITE_SSIZE_T_MUTABLE(lg_dirty_mult, arenas.lg_dirty_mult)
OPT_WRITE_CHAR_P(purge)
if (opt_purge == purge_mode_ratio) {
OPT_WRITE_SSIZE_T_MUTABLE(lg_dirty_mult,
arenas.lg_dirty_mult)
}
if (opt_purge == purge_mode_decay)
OPT_WRITE_SSIZE_T_MUTABLE(decay_time, arenas.decay_time)
OPT_WRITE_BOOL(stats_print)
OPT_WRITE_CHAR_P(junk)
OPT_WRITE_SIZE_T(quarantine)
@@ -531,13 +546,22 @@ stats_print(void (*write_cb)(void *, const char *), void *cbopaque,
malloc_cprintf(write_cb, cbopaque, "Page size: %zu\n", sv);
CTL_GET("arenas.lg_dirty_mult", &ssv, ssize_t);
if (ssv >= 0) {
if (opt_purge == purge_mode_ratio) {
if (ssv >= 0) {
malloc_cprintf(write_cb, cbopaque,
"Min active:dirty page ratio per arena: "
"%u:1\n", (1U << ssv));
} else {
malloc_cprintf(write_cb, cbopaque,
"Min active:dirty page ratio per arena: "
"N/A\n");
}
}
CTL_GET("arenas.decay_time", &ssv, ssize_t);
if (opt_purge == purge_mode_decay) {
malloc_cprintf(write_cb, cbopaque,
"Min active:dirty page ratio per arena: %u:1\n",
(1U << ssv));
} else {
malloc_cprintf(write_cb, cbopaque,
"Min active:dirty page ratio per arena: N/A\n");
"Unused dirty page decay time: %zd%s\n",
ssv, (ssv < 0) ? " (no decay)" : "");
}
if (je_mallctl("arenas.tcache_max", &sv, &ssz, NULL, 0) == 0) {
malloc_cprintf(write_cb, cbopaque,