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| author | Wanpeng Li <liwanp@linux.vnet.ibm.com> | 2013-04-02 06:46:15 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-04-02 23:49:51 +0400 |
| commit | b0749e77ae972713c1734cea069f32597ecedbd5 (patch) | |
| tree | ef99772356a2cae06f105456ffdb747995d71a4b /drivers/staging/zcache | |
| parent | 8762c7dde745f1de0488c6a3ed6894390303f76f (diff) | |
| download | linux-b0749e77ae972713c1734cea069f32597ecedbd5.tar.xz | |
staging: zcache: handle zcache_[eph|pers]_zpages for zero-filled page
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@oracle.com>: patch description]
Acked-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/zcache')
| -rw-r--r-- | 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 927d5fdaa3b1..1994cab6edf1 100644 --- a/drivers/staging/zcache/zcache-main.c +++ b/drivers/staging/zcache/zcache-main.c @@ -648,6 +648,8 @@ 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; @@ -696,8 +698,11 @@ 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); |