From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757884Ab3CSJ0w (ORCPT ); Tue, 19 Mar 2013 05:26:52 -0400 Received: from e23smtp09.au.ibm.com ([202.81.31.142]:53796 "EHLO e23smtp09.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932884Ab3CSJ0s (ORCPT ); Tue, 19 Mar 2013 05:26:48 -0400 From: Wanpeng Li 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, Wanpeng Li Subject: [PATCH v4 7/8] staging: zcache: introduce zero-filled page stat count Date: Tue, 19 Mar 2013 17:25:49 +0800 Message-Id: <1363685150-18303-8-git-send-email-liwanp@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1363685150-18303-1-git-send-email-liwanp@linux.vnet.ibm.com> References: <1363685150-18303-1-git-send-email-liwanp@linux.vnet.ibm.com> x-cbid: 13031909-3568-0000-0000-0000034F3AB9 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce zero-filled page statistics to monitor the number of zero-filled pages. Acked-by: Dan Magenheimer Signed-off-by: Wanpeng Li --- drivers/staging/zcache/debug.h | 15 +++++++++++++++ drivers/staging/zcache/zcache-main.c | 5 +++++ 2 files changed, 20 insertions(+), 0 deletions(-) diff --git a/drivers/staging/zcache/debug.h b/drivers/staging/zcache/debug.h index 8ec82d4..178bf75 100644 --- a/drivers/staging/zcache/debug.h +++ b/drivers/staging/zcache/debug.h @@ -122,6 +122,21 @@ static inline void dec_zcache_pers_zpages(unsigned zpages) zcache_pers_zpages = atomic_sub_return(zpages, &zcache_pers_zpages_atomic); } +extern ssize_t zcache_zero_filled_pages; +static atomic_t zcache_zero_filled_pages_atomic = ATOMIC_INIT(0); +extern ssize_t zcache_zero_filled_pages_max; +static inline void inc_zcache_zero_filled_pages(void) +{ + zcache_zero_filled_pages = atomic_inc_return( + &zcache_zero_filled_pages_atomic); + if (zcache_zero_filled_pages > zcache_zero_filled_pages_max) + zcache_zero_filled_pages_max = zcache_zero_filled_pages; +} +static inline void dec_zcache_zero_filled_pages(void) +{ + zcache_zero_filled_pages = atomic_dec_return( + &zcache_zero_filled_pages_atomic); +} static inline unsigned long curr_pageframes_count(void) { return zcache_pageframes_alloced - diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c index d1118f0..f8ba619 100644 --- a/drivers/staging/zcache/zcache-main.c +++ b/drivers/staging/zcache/zcache-main.c @@ -176,6 +176,8 @@ ssize_t zcache_pers_ate_eph; ssize_t zcache_pers_ate_eph_failed; ssize_t zcache_evicted_eph_zpages; ssize_t zcache_evicted_eph_pageframes; +ssize_t zcache_zero_filled_pages; +ssize_t zcache_zero_filled_pages_max; /* Used by this code. */ ssize_t zcache_last_active_file_pageframes; @@ -404,6 +406,7 @@ static void *zcache_pampd_eph_create(char *data, size_t size, bool raw, if (page_is_zero_filled(page)) { clen = 0; zero_filled = true; + inc_zcache_zero_filled_pages(); goto got_pampd; } @@ -470,6 +473,7 @@ static void *zcache_pampd_pers_create(char *data, size_t size, bool raw, if (page_is_zero_filled(page)) { clen = 0; zero_filled = true; + inc_zcache_zero_filled_pages(); goto got_pampd; } @@ -682,6 +686,7 @@ static int zcache_pampd_get_data_and_free(char *data, size_t *sizep, bool raw, zpages = 1; if (!raw) *sizep = PAGE_SIZE; + dec_zcache_zero_filled_pages(); goto zero_fill; } -- 1.7.7.6