From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx194.postini.com [74.125.245.194]) by kanga.kvack.org (Postfix) with SMTP id 619826B0037 for ; Mon, 1 Apr 2013 22:46:40 -0400 (EDT) Received: from /spool/local by e23smtp02.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 2 Apr 2013 12:39:22 +1000 Received: from d23relay05.au.ibm.com (d23relay05.au.ibm.com [9.190.235.152]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id 533CE2CE804D for ; Tue, 2 Apr 2013 13:46:33 +1100 (EST) Received: from d23av04.au.ibm.com (d23av04.au.ibm.com [9.190.235.139]) by d23relay05.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r322XFhK3539328 for ; Tue, 2 Apr 2013 13:33:16 +1100 Received: from d23av04.au.ibm.com (loopback [127.0.0.1]) by d23av04.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r322kWI5027595 for ; Tue, 2 Apr 2013 13:46:32 +1100 From: Wanpeng Li Subject: [PATCH v5 3/8] staging: zcache: handle zcache_[eph|pers]_zpages for zero-filled page Date: Tue, 2 Apr 2013 10:46:15 +0800 Message-Id: <1364870780-16296-4-git-send-email-liwanp@linux.vnet.ibm.com> In-Reply-To: <1364870780-16296-1-git-send-email-liwanp@linux.vnet.ibm.com> References: <1364870780-16296-1-git-send-email-liwanp@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Greg Kroah-Hartman Cc: Andrew Morton , Dan Magenheimer , Seth Jennings , Konrad Rzeszutek Wilk , Minchan Kim , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven , Fengguang Wu , Wanpeng Li 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 --- 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 961fbf1..14dcf8a 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); -- 1.7.7.6 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org