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| author | Johannes Weiner <hannes@cmpxchg.org> | 2018-10-26 15:06:39 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-26 16:26:33 -0700 |
| commit | 68d48e6a2df575b935edd420396c3cb8b6aa6ad3 (patch) | |
| tree | 65782c01f3abd521fffc93ea78166915882ddb57 /mm/workingset.c | |
| parent | 505802a53510e54ad5fbbd655a68893df83bfb91 (diff) | |
| download | linux-68d48e6a2df575b935edd420396c3cb8b6aa6ad3.tar.gz linux-68d48e6a2df575b935edd420396c3cb8b6aa6ad3.tar.bz2 linux-68d48e6a2df575b935edd420396c3cb8b6aa6ad3.zip | |
mm: workingset: add vmstat counter for shadow nodes
Make it easier to catch bugs in the shadow node shrinker by adding a
counter for the shadow nodes in circulation.
[akpm@linux-foundation.org: assert that irqs are disabled, for __inc_lruvec_page_state()]
[akpm@linux-foundation.org: s/WARN_ON_ONCE/VM_WARN_ON_ONCE/, per Johannes]
Link: http://lkml.kernel.org/r/20181009184732.762-4-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/workingset.c')
| -rw-r--r-- | mm/workingset.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/mm/workingset.c b/mm/workingset.c index 5a72c9d5e195..7e6ef312cea5 100644 --- a/mm/workingset.c +++ b/mm/workingset.c @@ -377,12 +377,20 @@ void workingset_update_node(struct radix_tree_node *node) * already where they should be. The list_empty() test is safe * as node->private_list is protected by the i_pages lock. */ + VM_WARN_ON_ONCE(!irqs_disabled()); /* For __inc_lruvec_page_state */ + if (node->count && node->count == node->exceptional) { - if (list_empty(&node->private_list)) + if (list_empty(&node->private_list)) { list_lru_add(&shadow_nodes, &node->private_list); + __inc_lruvec_page_state(virt_to_page(node), + WORKINGSET_NODES); + } } else { - if (!list_empty(&node->private_list)) + if (!list_empty(&node->private_list)) { list_lru_del(&shadow_nodes, &node->private_list); + __dec_lruvec_page_state(virt_to_page(node), + WORKINGSET_NODES); + } } } @@ -473,6 +481,8 @@ static enum lru_status shadow_lru_isolate(struct list_head *item, } list_lru_isolate(lru, item); + __dec_lruvec_page_state(virt_to_page(node), WORKINGSET_NODES); + spin_unlock(lru_lock); /* |