Increment/decrement zcache_[eph|pers]_zpages for zero-filled pages,
the main point of the counters for zpages and pageframes is to be
able to calculate density == zpages/pageframes. A zero-filled page
becomes a zpage that "compresses" to zero bytes and, as a result,
requires zero pageframes for storage. So the zpages counter should
be increased but the pageframes counter should not.
[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>: patch description]
Acked-by: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
---
drivers/staging/zcache/zcache-main.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index 050a99f..892e97e 100644
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -647,6 +647,8 @@ static int zcache_pampd_get_data_and_free(char *data, size_t *sizep, bool raw,
if (pampd == (void *)ZERO_FILLED) {
handle_zero_filled_page(data);
zero_filled = true;
+ zsize = 0;
+ zpages = 1;
if (!raw)
*sizep = PAGE_SIZE;
goto zero_fill;
@@ -695,8 +697,11 @@ static void zcache_pampd_free(void *pampd, struct tmem_pool *pool,
BUG_ON(preemptible());
- if (pampd == (void *)ZERO_FILLED)
+ if (pampd == (void *)ZERO_FILLED) {
zero_filled = true;
+ zsize = 0;
+ zpages = 1;
+ }
if (pampd_is_remote(pampd) && !zero_filled) {
BUG_ON(!ramster_enabled);
--
1.7.7.6
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