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Add arena.i.retain_grow_limit

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This option controls the max size when grow_retained.  This is useful when we
have customized extent hooks reserving physical memory (e.g. 1G huge pages).
Without this feature, the default increasing sequence could result in fragmented
and wasted physical memory.
This commit is contained in:
Qi Wang
2017-11-02 17:48:39 -07:00
committed by Qi Wang
parent 9f455e2786
commit e422fa8e7e
8 changed files with 146 additions and 5 deletions
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42
src/ctl.c
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@@ -118,6 +118,7 @@ CTL_PROTO(arena_i_dss)
CTL_PROTO(arena_i_dirty_decay_ms)
CTL_PROTO(arena_i_muzzy_decay_ms)
CTL_PROTO(arena_i_extent_hooks)
CTL_PROTO(arena_i_retain_grow_limit)
INDEX_PROTO(arena_i)
CTL_PROTO(arenas_bin_i_size)
CTL_PROTO(arenas_bin_i_nregs)
@@ -320,7 +321,8 @@ static const ctl_named_node_t arena_i_node[] = {
{NAME("dss"), CTL(arena_i_dss)},
{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)}
{NAME("extent_hooks"), CTL(arena_i_extent_hooks)},
{NAME("retain_grow_limit"), CTL(arena_i_retain_grow_limit)}
};
static const ctl_named_node_t super_arena_i_node[] = {
{NAME(""), CHILD(named, arena_i)}
@@ -2199,6 +2201,42 @@ label_return:
return ret;
}
static int
arena_i_retain_grow_limit_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;
arena_t *arena;
if (!opt_retain) {
/* Only relevant when retain is enabled. */
return ENOENT;
}
malloc_mutex_lock(tsd_tsdn(tsd), &ctl_mtx);
MIB_UNSIGNED(arena_ind, 1);
if (arena_ind < narenas_total_get() && (arena =
arena_get(tsd_tsdn(tsd), arena_ind, false)) != NULL) {
size_t old_limit, new_limit;
if (newp != NULL) {
WRITE(new_limit, size_t);
}
bool err = arena_retain_grow_limit_get_set(tsd, arena,
&old_limit, newp != NULL ? &new_limit : NULL);
if (!err) {
READ(old_limit, size_t);
ret = 0;
} else {
ret = EFAULT;
}
} else {
ret = EFAULT;
}
label_return:
malloc_mutex_unlock(tsd_tsdn(tsd), &ctl_mtx);
return ret;
}
static const ctl_named_node_t *
arena_i_index(tsdn_t *tsdn, const size_t *mib, size_t miblen, size_t i) {
const ctl_named_node_t *ret;
@@ -2260,7 +2298,7 @@ arenas_decay_ms_ctl_impl(tsd_t *tsd, const size_t *mib, size_t miblen,
ret = EINVAL;
goto label_return;
}
if (dirty ? arena_dirty_decay_ms_default_set(*(ssize_t *)newp)
if (dirty ? arena_dirty_decay_ms_default_set(*(ssize_t *)newp)
: arena_muzzy_decay_ms_default_set(*(ssize_t *)newp)) {
ret = EFAULT;
goto label_return;