[PATCH 01/10] staging: zcache: fix account foregin counters against zero-filled pages

[Wanpeng Li <liwanp@linux.vnet.ibm.com>]

zero-filled pages won't be compressed and sent to remote system. Monitor
the number ephemeral and persistent pages that Ramster has sent make no
sense. This patch skip account foregin counters against zero-filled pages.

Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
 drivers/staging/zcache/zcache-main.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index f3de76d..e23d814 100644
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -415,7 +415,7 @@ create_in_new_page:
 got_pampd:
 	inc_zcache_eph_zbytes(clen);
 	inc_zcache_eph_zpages();
-	if (ramster_enabled && raw)
+	if (ramster_enabled && raw && !zero_filled)
 		ramster_count_foreign_pages(true, 1);
 	if (zero_filled)
 		pampd = (void *)ZERO_FILLED;
@@ -500,7 +500,7 @@ create_in_new_page:
 got_pampd:
 	inc_zcache_pers_zpages();
 	inc_zcache_pers_zbytes(clen);
-	if (ramster_enabled && raw)
+	if (ramster_enabled && raw && !zero_filled)
 		ramster_count_foreign_pages(false, 1);
 	if (zero_filled)
 		pampd = (void *)ZERO_FILLED;
@@ -681,7 +681,7 @@ zero_fill:
 		dec_zcache_pers_zpages(zpages);
 		dec_zcache_pers_zbytes(zsize);
 	}
-	if (!is_local_client(pool->client))
+	if (!is_local_client(pool->client) && !zero_filled)
 		ramster_count_foreign_pages(eph, -1);
 	if (page && !zero_filled)
 		zcache_free_page(page);
@@ -732,7 +732,7 @@ static void zcache_pampd_free(void *pampd, struct tmem_pool *pool,
 		dec_zcache_pers_zpages(zpages);
 		dec_zcache_pers_zbytes(zsize);
 	}
-	if (!is_local_client(pool->client))
+	if (!is_local_client(pool->client) && !zero_filled)
 		ramster_count_foreign_pages(is_ephemeral(pool), -1);
 	if (page && !zero_filled)
 		zcache_free_page(page);
-- 
1.7.10.4

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