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Add a per-arena oversize_threshold.

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This can let manual arenas trade off memory and CPU the way auto arenas do.
This commit is contained in:
David Goldblatt 2020-11-11 13:34:43 -08:00 • committed by David Goldblatt
parent 4ca3d91e96
commit cf2549a149
10 changed files with 194 additions and 12 deletions
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38
src/ctl.c
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@ -151,6 +151,7 @@ CTL_PROTO(arena_i_purge)
CTL_PROTO(arena_i_reset)
CTL_PROTO(arena_i_destroy)
CTL_PROTO(arena_i_dss)
CTL_PROTO(arena_i_oversize_threshold)
CTL_PROTO(arena_i_dirty_decay_ms)
CTL_PROTO(arena_i_muzzy_decay_ms)
CTL_PROTO(arena_i_extent_hooks)
@ -431,6 +432,11 @@ static const ctl_named_node_t arena_i_node[] = {
{NAME("reset"), CTL(arena_i_reset)},
{NAME("destroy"), CTL(arena_i_destroy)},
{NAME("dss"), CTL(arena_i_dss)},
/*
* Undocumented for now, since we anticipate an arena API in flux after
* we cut the last 5-series release.
*/
{NAME("oversize_threshold"), CTL(arena_i_oversize_threshold)},
{NAME("dirty_decay_ms"), CTL(arena_i_dirty_decay_ms)},
{NAME("muzzy_decay_ms"), CTL(arena_i_muzzy_decay_ms)},
{NAME("extent_hooks"), CTL(arena_i_extent_hooks)},
@ -2530,6 +2536,38 @@ label_return:
return ret;
}
static int
arena_i_oversize_threshold_ctl(tsd_t *tsd, const size_t *mib, size_t miblen,
void *oldp, size_t *oldlenp, void *newp, size_t newlen) {
int ret;
unsigned arena_ind;
MIB_UNSIGNED(arena_ind, 1);
arena_t *arena = arena_get(tsd_tsdn(tsd), arena_ind, false);
if (arena == NULL) {
ret = EFAULT;
goto label_return;
}
if (oldp != NULL && oldlenp != NULL) {
size_t oldval = atomic_load_zu(
&arena->pa_shard.pac.oversize_threshold, ATOMIC_RELAXED);
READ(oldval, size_t);
}
if (newp != NULL) {
if (newlen != sizeof(size_t)) {
ret = EINVAL;
goto label_return;
}
atomic_store_zu(&arena->pa_shard.pac.oversize_threshold,
*(size_t *)newp, ATOMIC_RELAXED);
}
ret = 0;
label_return:
return ret;
}
static int
arena_i_decay_ms_ctl_impl(tsd_t *tsd, const size_t *mib, size_t miblen,
void *oldp, size_t *oldlenp, void *newp, size_t newlen, bool dirty) {