From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx156.postini.com [74.125.245.156]) by kanga.kvack.org (Postfix) with SMTP id 8EC666B0039 for ; Tue, 19 Mar 2013 05:26:21 -0400 (EDT) Received: from /spool/local by e23smtp04.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 19 Mar 2013 19:15:54 +1000 Received: from d23relay03.au.ibm.com (d23relay03.au.ibm.com [9.190.235.21]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id 3C2E82BB0023 for ; Tue, 19 Mar 2013 20:26:13 +1100 (EST) Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay03.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r2J9Q90D2031894 for ; Tue, 19 Mar 2013 20:26:09 +1100 Received: from d23av02.au.ibm.com (loopback [127.0.0.1]) by d23av02.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r2J9QCYq012642 for ; Tue, 19 Mar 2013 20:26:12 +1100 From: 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> 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> 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, Wanpeng Li 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 -- 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