This attribute returns the number of pages currently
in use by the xvmalloc pool used to store persistent
pages compressed by zcache. This attribute, in combination
with the curr_pages attribute of frontswap, can be used
to calculate the effective compression of frontswap
(i.e. zv_pool_pages_count/curr_pages)
Signed-off-by: Seth Jennings <sjenning@xxxxxxxxxxxxxxxxxx>
---
drivers/staging/zcache/zcache.c | 20 ++++++++++++++++++++
1 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/drivers/staging/zcache/zcache.c
b/drivers/staging/zcache/zcache.c
index 77ac2d4..9821d88 100644
--- a/drivers/staging/zcache/zcache.c
+++ b/drivers/staging/zcache/zcache.c
@@ -684,6 +684,23 @@ static struct {
struct xv_pool *xvpool;
} zcache_client;
+#ifdef CONFIG_SYSFS
+static int zv_show_pool_pages_count(char *buf)
+{
+ char *p = buf;
+ unsigned long numpages;
+
+ if (zcache_client.xvpool == NULL)
+ p += sprintf(p, "%d\n", 0);
+ else {
+ numpages = xv_get_total_size_bytes(zcache_client.xvpool);
+ p += sprintf(p, "%lu\n", numpages >> PAGE_SHIFT);
+ }
+
+ return p - buf;
+}
+#endif
+
/*
* Tmem operations assume the poolid implies the invoking client.
* Zcache only has one client (the kernel itself), so translate
@@ -1130,6 +1147,8 @@ ZCACHE_SYSFS_RO_CUSTOM(zbud_unbuddied_list_counts,
zbud_show_unbuddied_list_counts);
ZCACHE_SYSFS_RO_CUSTOM(zbud_cumul_chunk_counts,
zbud_show_cumul_chunk_counts);
+ZCACHE_SYSFS_RO_CUSTOM(zv_pool_pages_count,
+ zv_show_pool_pages_count);
static struct attribute *zcache_attrs[] = {
&zcache_curr_obj_count_attr.attr,
@@ -1160,6 +1179,7 @@ static struct attribute *zcache_attrs[] = {
&zcache_aborted_shrink_attr.attr,
&zcache_zbud_unbuddied_list_counts_attr.attr,
&zcache_zbud_cumul_chunk_counts_attr.attr,
+ &zcache_zv_pool_pages_count_attr.attr,
NULL,
};
--
1.7.0.4
--
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