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Track the leaked VM space via the abandoned_vm counter.

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The counter is 0 unless metadata allocation failed (indicates OOM), and is
mainly for sanity checking.
This commit is contained in:
Qi Wang
2019-07-15 15:56:05 -07:00
committed by Qi Wang
parent 42807fcd9e
commit 4e36ce34c1
5 changed files with 26 additions and 5 deletions
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16
src/extent.c
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@@ -619,16 +619,24 @@ label_return:
return extent;
}
/*
* This can only happen when we fail to allocate a new extent struct (which
* indicates OOM), e.g. when trying to split an existing extent.
*/
static void
extents_leak(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
extents_abandon_vm(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
extents_t *extents, extent_t *extent, bool growing_retained) {
size_t sz = extent_size_get(extent);
if (config_stats) {
arena_stats_accum_zu(&arena->stats.abandoned_vm, sz);
}
/*
* Leak extent after making sure its pages have already been purged, so
* that this is only a virtual memory leak.
*/
if (extents_state_get(extents) == extent_state_dirty) {
if (extent_purge_lazy_impl(tsdn, arena, r_extent_hooks,
extent, 0, extent_size_get(extent), growing_retained)) {
extent, 0, sz, growing_retained)) {
extent_purge_forced_impl(tsdn, arena, r_extent_hooks,
extent, 0, extent_size_get(extent),
growing_retained);
@@ -1083,7 +1091,7 @@ extent_recycle_split(tsdn_t *tsdn, arena_t *arena,
if (to_leak != NULL) {
void *leak = extent_base_get(to_leak);
extent_deregister_no_gdump_sub(tsdn, to_leak);
extents_leak(tsdn, arena, r_extent_hooks, extents,
extents_abandon_vm(tsdn, arena, r_extent_hooks, extents,
to_leak, growing_retained);
assert(extent_lock_from_addr(tsdn, rtree_ctx, leak,
false) == NULL);
@@ -1382,7 +1390,7 @@ extent_grow_retained(tsdn_t *tsdn, arena_t *arena,
}
if (to_leak != NULL) {
extent_deregister_no_gdump_sub(tsdn, to_leak);
extents_leak(tsdn, arena, r_extent_hooks,
extents_abandon_vm(tsdn, arena, r_extent_hooks,
&arena->extents_retained, to_leak, true);
}
goto label_err;