From: Wanpeng Li Date: Tue, 2 Apr 2013 02:46:15 +0000 (+0800) Subject: staging: zcache: handle zcache_[eph|pers]_zpages for zero-filled page X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=b0749e77ae972713c1734cea069f32597ecedbd5;p=openwrt%2Fstaging%2Fblogic.git 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 : patch description] Acked-by: Dan Magenheimer Reviewed-by: Konrad Rzeszutek Wilk Signed-off-by: Wanpeng Li Signed-off-by: Greg Kroah-Hartman --- 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);