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Mallctl: Add arenas.lookup

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Implement a new mallctl operation that allows looking up the arena a
region of memory belongs to.
This commit is contained in:
Latchesar Ionkov
2018-05-01 12:31:09 -06:00
committed by Qi Wang
parent 6df90600a7
commit a32b7bd567
3 changed files with 59 additions and 1 deletions
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34
src/ctl.c
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@@ -139,6 +139,7 @@ CTL_PROTO(arenas_nbins)
CTL_PROTO(arenas_nhbins)
CTL_PROTO(arenas_nlextents)
CTL_PROTO(arenas_create)
CTL_PROTO(arenas_lookup)
CTL_PROTO(prof_thread_active_init)
CTL_PROTO(prof_active)
CTL_PROTO(prof_dump)
@@ -373,7 +374,8 @@ static const ctl_named_node_t arenas_node[] = {
{NAME("bin"), CHILD(indexed, arenas_bin)},
{NAME("nlextents"), CTL(arenas_nlextents)},
{NAME("lextent"), CHILD(indexed, arenas_lextent)},
{NAME("create"), CTL(arenas_create)}
{NAME("create"), CTL(arenas_create)},
{NAME("lookup"), CTL(arenas_lookup)}
};
static const ctl_named_node_t prof_node[] = {
@@ -2471,6 +2473,36 @@ label_return:
return ret;
}
static int
arenas_lookup_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;
void *ptr;
extent_t *extent;
arena_t *arena;
ptr = NULL;
ret = EINVAL;
malloc_mutex_lock(tsd_tsdn(tsd), &ctl_mtx);
WRITE(ptr, void *);
extent = iealloc(tsd_tsdn(tsd), ptr);
if (extent == NULL)
goto label_return;
arena = extent_arena_get(extent);
if (arena == NULL)
goto label_return;
arena_ind = arena_ind_get(arena);
READ(arena_ind, unsigned);
ret = 0;
label_return:
malloc_mutex_unlock(tsd_tsdn(tsd), &ctl_mtx);
return ret;
}
/******************************************************************************/
static int