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Implement the arena.<i>.reset mallctl.

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This makes it possible to discard all of an arena's allocations in a
single operation.

This resolves #146.
This commit is contained in:
Jason Evans 2016-04-22 14:37:17 -07:00
parent 66cd953514
commit 19ff2cefba
8 changed files with 411 additions and 39 deletions
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36
src/ctl.c
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@ -120,6 +120,7 @@ CTL_PROTO(tcache_destroy)
static void arena_i_purge(tsd_t *tsd, unsigned arena_ind, bool all);
CTL_PROTO(arena_i_purge)
CTL_PROTO(arena_i_decay)
CTL_PROTO(arena_i_reset)
CTL_PROTO(arena_i_dss)
CTL_PROTO(arena_i_lg_dirty_mult)
CTL_PROTO(arena_i_decay_time)
@ -299,6 +300,7 @@ static const ctl_named_node_t tcache_node[] = {
static const ctl_named_node_t arena_i_node[] = {
{NAME("purge"), CTL(arena_i_purge)},
{NAME("decay"), CTL(arena_i_decay)},
{NAME("reset"), CTL(arena_i_reset)},
{NAME("dss"), CTL(arena_i_dss)},
{NAME("lg_dirty_mult"), CTL(arena_i_lg_dirty_mult)},
{NAME("decay_time"), CTL(arena_i_decay_time)},
@ -1602,6 +1604,40 @@ label_return:
return (ret);
}
static int
arena_i_reset_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;
READONLY();
WRITEONLY();
if ((config_valgrind && unlikely(in_valgrind)) || (config_fill &&
unlikely(opt_quarantine))) {
ret = EFAULT;
goto label_return;
}
arena_ind = (unsigned)mib[1];
if (config_debug) {
malloc_mutex_lock(tsd, &ctl_mtx);
assert(arena_ind < ctl_stats.narenas);
malloc_mutex_unlock(tsd, &ctl_mtx);
}
assert(arena_ind >= opt_narenas);
arena = arena_get(tsd, arena_ind, false);
arena_reset(tsd, arena);
ret = 0;
label_return:
return (ret);
}
static int
arena_i_dss_ctl(tsd_t *tsd, const size_t *mib, size_t miblen, void *oldp,
size_t *oldlenp, void *newp, size_t newlen)