From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261702AbVD0GiC (ORCPT ); Wed, 27 Apr 2005 02:38:02 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261695AbVD0GiC (ORCPT ); Wed, 27 Apr 2005 02:38:02 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:24776 "EHLO fgwmail5.fujitsu.co.jp") by vger.kernel.org with ESMTP id S261702AbVD0GhP (ORCPT ); Wed, 27 Apr 2005 02:37:15 -0400 Message-ID: <426F3445.9060701@jp.fujitsu.com> Date: Wed, 27 Apr 2005 15:42:13 +0900 From: KAMEZAWA Hiroyuki User-Agent: Mozilla Thunderbird 1.0.2 (Windows/20050317) X-Accept-Language: ja, en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org, Andrew Morton Subject: [PATCH] counting bounce buffer in vmstat Content-Type: multipart/mixed; boundary="------------090102000300040902030602" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This is a multi-part message in MIME format. --------------090102000300040902030602 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi, This is a updated version of a patch for counting bouce buffer page. A major change is : /proc/vmstat is used to show usage. Thanks -- Kame --------------090102000300040902030602 Content-Type: text/plain; name="count_bounce.patch" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="count_bounce.patch" This is a patch for counting the number of pages for bounce buffer. It's shown in /proc/vmstat. Currently, the number of bounce pages are not counted anywhere. So, if there are many bounce pages, it seems that there are leaked pages. And it's difficult for a user to imagine the usage of bounce pages. So, it's meaningful to show # of bouce pages. Signed-off-by: KAMEZAWA Hiroyuki --- linux-2.6.12-rc2-mm3-kamezawa/include/linux/page-flags.h | 1 + linux-2.6.12-rc2-mm3-kamezawa/mm/highmem.c | 2 ++ linux-2.6.12-rc2-mm3-kamezawa/mm/page_alloc.c | 1 + 3 files changed, 4 insertions(+) diff -puN mm/highmem.c~count_bounce mm/highmem.c --- linux-2.6.12-rc2-mm3/mm/highmem.c~count_bounce 2005-04-25 12:04:28.000000000 +0900 +++ linux-2.6.12-rc2-mm3-kamezawa/mm/highmem.c 2005-04-27 10:25:51.000000000 +0900 @@ -325,6 +325,7 @@ static void bounce_end_io(struct bio *bi continue; mempool_free(bvec->bv_page, pool); + dec_page_state(nr_bounce); } bio_endio(bio_orig, bio_orig->bi_size, err); @@ -405,6 +406,7 @@ static void __blk_queue_bounce(request_q to->bv_page = mempool_alloc(pool, q->bounce_gfp); to->bv_len = from->bv_len; to->bv_offset = from->bv_offset; + inc_page_state(nr_bounce); if (rw == WRITE) { char *vto, *vfrom; diff -puN mm/page_alloc.c~count_bounce mm/page_alloc.c --- linux-2.6.12-rc2-mm3/mm/page_alloc.c~count_bounce 2005-04-27 10:15:39.000000000 +0900 +++ linux-2.6.12-rc2-mm3-kamezawa/mm/page_alloc.c 2005-04-27 10:17:18.000000000 +0900 @@ -1902,6 +1902,7 @@ static char *vmstat_text[] = { "nr_page_table_pages", "nr_mapped", "nr_slab", + "nr_bounce", "pgpgin", "pgpgout", diff -puN include/linux/page-flags.h~count_bounce include/linux/page-flags.h --- linux-2.6.12-rc2-mm3/include/linux/page-flags.h~count_bounce 2005-04-27 10:23:15.000000000 +0900 +++ linux-2.6.12-rc2-mm3-kamezawa/include/linux/page-flags.h 2005-04-27 10:24:11.000000000 +0900 @@ -89,6 +89,7 @@ struct page_state { unsigned long nr_page_table_pages;/* Pages used for pagetables */ unsigned long nr_mapped; /* mapped into pagetables */ unsigned long nr_slab; /* In slab */ + unsigned long nr_bounce; /* pages for bounce buffers */ #define GET_PAGE_STATE_LAST nr_slab /* _ --------------090102000300040902030602--