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-rw-r--r--Documentation/filesystems/proc.rst6
-rw-r--r--fs/proc/meminfo.c7
-rw-r--r--include/linux/swap.h5
-rw-r--r--include/linux/vm_event_item.h4
-rw-r--r--mm/vmstat.c4
-rw-r--r--mm/zswap.c13
6 files changed, 32 insertions, 7 deletions
diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index 5e9791457876..cfec3cab0f9a 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -964,6 +964,8 @@ Example output. You may not have all of these fields.
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
+ Zswap: 1904 kB
+ Zswapped: 7792 kB
Dirty: 12 kB
Writeback: 0 kB
AnonPages: 4654780 kB
@@ -1055,6 +1057,10 @@ SwapTotal
SwapFree
Memory which has been evicted from RAM, and is temporarily
on the disk
+Zswap
+ Memory consumed by the zswap backend (compressed size)
+Zswapped
+ Amount of anonymous memory stored in zswap (original size)
Dirty
Memory which is waiting to get written back to the disk
Writeback
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 6fa761c9cc78..6e89f0e2fd20 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -86,6 +86,13 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
show_val_kb(m, "SwapTotal: ", i.totalswap);
show_val_kb(m, "SwapFree: ", i.freeswap);
+#ifdef CONFIG_ZSWAP
+ seq_printf(m, "Zswap: %8lu kB\n",
+ (unsigned long)(zswap_pool_total_size >> 10));
+ seq_printf(m, "Zswapped: %8lu kB\n",
+ (unsigned long)atomic_read(&zswap_stored_pages) <<
+ (PAGE_SHIFT - 10));
+#endif
show_val_kb(m, "Dirty: ",
global_node_page_state(NR_FILE_DIRTY));
show_val_kb(m, "Writeback: ",
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 04c0713c1d6e..f3ae17b43f20 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -620,6 +620,11 @@ static inline int mem_cgroup_swappiness(struct mem_cgroup *mem)
}
#endif
+#ifdef CONFIG_ZSWAP
+extern u64 zswap_pool_total_size;
+extern atomic_t zswap_stored_pages;
+#endif
+
#if defined(CONFIG_SWAP) && defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP)
extern void __cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask);
static inline void cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask)
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index e83967e4c20e..404024486fa5 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -136,6 +136,10 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
#ifdef CONFIG_KSM
COW_KSM,
#endif
+#ifdef CONFIG_ZSWAP
+ ZSWPIN,
+ ZSWPOUT,
+#endif
#ifdef CONFIG_X86
DIRECT_MAP_LEVEL2_SPLIT,
DIRECT_MAP_LEVEL3_SPLIT,
diff --git a/mm/vmstat.c b/mm/vmstat.c
index b94a2e4723ff..da525bfb6f4a 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1396,6 +1396,10 @@ const char * const vmstat_text[] = {
#ifdef CONFIG_KSM
"cow_ksm",
#endif
+#ifdef CONFIG_ZSWAP
+ "zswpin",
+ "zswpout",
+#endif
#ifdef CONFIG_X86
"direct_map_level2_splits",
"direct_map_level3_splits",
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);