diff options
| author | Johannes Weiner <hannes@cmpxchg.org> | 2022-05-19 14:08:53 -0700 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-05-19 14:08:53 -0700 |
| commit | f6498b776d280b30a4614d8261840961e993c2c8 (patch) | |
| tree | b35704e2a62cc7630d06658fc6faaeba24b18e2a /mm/zswap.c | |
| parent | b3fbd58fcbb10725a1314688e03b1af6827c42f9 (diff) | |
mm: zswap: add basic meminfo and vmstat coverage
Currently it requires poking at debugfs to figure out the size and
population of the zswap cache on a host. There are no counters for reads
and writes against the cache. As a result, it's difficult to understand
zswap behavior on production systems.
Print zswap memory consumption and how many pages are zswapped out in
/proc/meminfo. Count zswapouts and zswapins in /proc/vmstat.
Link: https://lkml.kernel.org/r/20220510152847.230957-6-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/zswap.c')
| -rw-r--r-- | mm/zswap.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/mm/zswap.c b/mm/zswap.c index 2c5db4cbedea..e3c16a70f533 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -42,9 +42,9 @@ * statistics **********************************/ /* Total bytes used by the compressed storage */ -static u64 zswap_pool_total_size; +u64 zswap_pool_total_size; /* The number of compressed pages currently stored in zswap */ -static atomic_t zswap_stored_pages = ATOMIC_INIT(0); +atomic_t zswap_stored_pages = ATOMIC_INIT(0); /* The number of same-value filled pages currently stored in zswap */ static atomic_t zswap_same_filled_pages = ATOMIC_INIT(0); @@ -1243,6 +1243,7 @@ insert_entry: /* update stats */ atomic_inc(&zswap_stored_pages); zswap_update_total_size(); + count_vm_event(ZSWPOUT); return 0; @@ -1285,11 +1286,10 @@ static int zswap_frontswap_load(unsigned type, pgoff_t offset, zswap_fill_page(dst, entry->value); kunmap_atomic(dst); ret = 0; - goto freeentry; + goto stats; } if (!zpool_can_sleep_mapped(entry->pool->zpool)) { - tmp = kmalloc(entry->length, GFP_ATOMIC); if (!tmp) { ret = -ENOMEM; @@ -1304,10 +1304,8 @@ static int zswap_frontswap_load(unsigned type, pgoff_t offset, src += sizeof(struct zswap_header); if (!zpool_can_sleep_mapped(entry->pool->zpool)) { - memcpy(tmp, src, entry->length); src = tmp; - zpool_unmap_handle(entry->pool->zpool, entry->handle); } @@ -1326,7 +1324,8 @@ static int zswap_frontswap_load(unsigned type, pgoff_t offset, kfree(tmp); BUG_ON(ret); - +stats: + count_vm_event(ZSWPIN); freeentry: spin_lock(&tree->lock); zswap_entry_put(tree, entry); |