From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752700Ab3J2XZU (ORCPT ); Tue, 29 Oct 2013 19:25:20 -0400 Received: from mailout2.samsung.com ([203.254.224.25]:43221 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752232Ab3J2XZQ (ORCPT ); Tue, 29 Oct 2013 19:25:16 -0400 X-AuditID: cbfee68f-b7f836d000001b39-a0-527043da26bc From: Changman Lee To: "'Chao Yu'" , jaegeuk.kim@samsung.com Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net References: <001f01ced473$4c5cc9c0$e5165d40$@samsung.com> <002a01ced479$925505e0$b6ff11a0$@samsung.com> <002401ced495$01a50290$04ef07b0$@samsung.com> In-reply-to: <002401ced495$01a50290$04ef07b0$@samsung.com> Subject: RE: [f2fs-dev] [PATCH V2 RESEND] f2fs: check all ones or zeros bitmap with bitops for better mount performance Date: Wed, 30 Oct 2013 08:25:14 +0900 Message-id: <016901ced4fe$1f0c3b00$5d24b100$@samsung.com> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit X-Mailer: Microsoft Outlook 14.0 Thread-index: AQJDVWMDlPIi5BHzS0Bii3fNyqKrlQE3RkV6AjXgZhyZB+Wu8A== Content-language: ko X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrNIsWRmVeSWpSXmKPExsVy+t8zY93bzgVBBq1pFv+bPrJZXN/1l8ni 0iJ3iz17T7JYXN41h82B1WP3gs9MHn1bVjF6fN4kF8AcxWWTkpqTWZZapG+XwJUxeccEloKX ihUX/7UzNzBeke5i5OCQEDCRmHUtoYuRE8gUk7hwbz0biC0ksIxR4uOpTIi4icSTux+Yuhi5 gOLTGSV6us5BOX8ZJR51/WQBqWIT0JJoP70WzBYRsJWYu/EWM4jNLJApMef1ZFaIhpmMEjvm PGEFSXAKWEn8W3KIEcQWFqiU2DV/LhOIzSKgKrFl7wp2EJtXwFKisfUcM4QtKPFj8j0WiKFa Eut3HmeCsOUlNq95ywxxqoLEjrOvGUE+ExFwklg9xQOiRERi34t3jCA3SAicY5eYvaOFFWKX gMS3yYdYICEhK7HpANQYSYmDK26wTGCUmIVk8ywkm2ch2TwLyYoFjCyrGEVTC5ILipPSi4z1 ihNzi0vz0vWS83M3MUIisn8H490D1ocYk4HWT2SWEk3OB0Z0Xkm8obGZkYWpiamxkbmlGWnC SuK89x8mBQkJpCeWpGanphakFsUXleakFh9iZOLglGpgnDNxYajMS4fzV28//bVTtjaELbkr 4r2WYFpxaOtWw7VlN0T5+Iz73wTe2PfRxaZs2t1jtrffm9v+/1Swy7ume0Fm9ayDoT5O9zTV PuTcfeo0+eKHM95NvyYw3cyLt7l+YPnq+w/834cLTg2LfmJTrbyfcfYG+7t3lsxO/m70TUIo VfA7p+VMGSWW4oxEQy3mouJEAEkUvyHeAgAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrNKsWRmVeSWpSXmKPExsVy+t9jQd1bzgVBBgf7LS3+N31ks7i+6y+T xaVF7hZ79p5ksbi8aw6bA6vH7gWfmTz6tqxi9Pi8SS6AOaqB0SYjNTEltUghNS85PyUzL91W yTs43jne1MzAUNfQ0sJcSSEvMTfVVsnFJ0DXLTMHaKWSQlliTilQKCCxuFhJ3w7ThNAQN10L mMYIXd+QILgeIwM0kLCOMWPyjgksBS8VKy7+a2duYLwi3cXIySEhYCLx5O4HJghbTOLCvfVs XYxcHEIC0xklerrOMUE4fxklHnX9ZAGpYhPQkmg/vRbMFhGwlZi78RYziM0skCkx5/VkVoiG mYwSO+Y8YQVJcApYSfxbcogRxBYWqJTYNX8u2DoWAVWJLXtXsIPYvAKWEo2t55ghbEGJH5Pv sUAM1ZJYv/M4E4QtL7F5zVtmiFMVJHacfQ00kwPoCCeJ1VM8IEpEJPa9eMc4gVFoFpJJs5BM moVk0iwkLQsYWVYxiqYWJBcUJ6XnGuoVJ+YWl+al6yXn525iBEf9M6kdjCsbLA4xCnAwKvHw GjzIDxJiTSwrrsw9xCjBwawkwjv9OFCINyWxsiq1KD++qDQntfgQYzLQoxOZpUST84EJKa8k 3tDYxMzI0sjMwsjE3Jw0YSVx3gOt1oFCAumJJanZqakFqUUwW5g4OKUaGHVOC61ek/cj7dHd n0+XsZxSfNatstJgedn/h9VFFZxxjK/SA46Gte+5M/9f9omS6qotgmFVrrMjpFq3rk96IRTw LV2K7eLW+29OvQxv/xOa/tGE99n2FtfQXN5dzC/2nfULfPt9d+G5B0VBcn/LvMsX+zuahQu/ zLx3ISjd+NSfc5EsG1QOMSqxFGckGmoxFxUnAgB4wtX/PgMAAA== DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org As you know, if any data or function are used once, we can use some keywords like __initdata for data and __init for function. -----Original Message----- From: Chao Yu [mailto:chao2.yu@samsung.com] Sent: Tuesday, October 29, 2013 7:52 PM To: 'Changman Lee'; jaegeuk.kim@samsung.com Cc: linux-fsdevel@vger.kernel.org; linux-kernel@vger.kernel.org; linux-f2fs-devel@lists.sourceforge.net Subject: RE: [f2fs-dev] [PATCH V2 RESEND] f2fs: check all ones or zeros bitmap with bitops for better mount performance Hi Lee, > -----Original Message----- > From: Changman Lee [mailto:cm224.lee@samsung.com] > Sent: Tuesday, October 29, 2013 3:36 PM > To: 'Chao Yu'; jaegeuk.kim@samsung.com > Cc: linux-fsdevel@vger.kernel.org; linux-kernel@vger.kernel.org; > linux-f2fs-devel@lists.sourceforge.net > Subject: RE: [f2fs-dev] [PATCH V2 RESEND] f2fs: check all ones or > zeros bitmap > with bitops for better mount performance > > Review attached patch, please. Could we hide the pre calculated value by generating it in allocated memory by func, because the value will be no use after build_sit_entries(); Regards Yu > > -----Original Message----- > From: Chao Yu [mailto:chao2.yu@samsung.com] > Sent: Tuesday, October 29, 2013 3:51 PM > To: jaegeuk.kim@samsung.com > Cc: linux-fsdevel@vger.kernel.org; linux-kernel@vger.kernel.org; > linux-f2fs-devel@lists.sourceforge.net > Subject: [f2fs-dev] [PATCH V2 RESEND] f2fs: check all ones or zeros > bitmap with > bitops for better mount performance > > Previously, check_block_count check valid_map with bit data type in > common scenario that sit has all ones or zeros bitmap, it makes low > mount performance. > So let's check the special bitmap with integer data type instead of > the bit one. > > v1-->v2: > use find_next_{zero_}bit_le for better performance and readable as > Jaegeuk suggested. > use neat logogram in comment as Gu Zheng suggested. > search continuous ones or zeros for better performance when checking > mixed bitmap. > > Suggested-by: Jaegeuk Kim > Signed-off-by: Shu Tan > Signed-off-by: Chao Yu > --- > fs/f2fs/segment.h | 19 +++++++++++++++---- > 1 file changed, 15 insertions(+), 4 deletions(-) > > diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h index > abe7094..a7abfa8 > 100644 > --- a/fs/f2fs/segment.h > +++ b/fs/f2fs/segment.h > @@ -550,8 +550,9 @@ static inline void check_block_count(struct > f2fs_sb_info *sbi, { > struct f2fs_sm_info *sm_info = SM_I(sbi); > unsigned int end_segno = sm_info->segment_count - 1; > + bool is_valid = test_bit_le(0, raw_sit->valid_map) ? true : false; > int valid_blocks = 0; > - int i; > + int cur_pos = 0, next_pos; > > /* check segment usage */ > BUG_ON(GET_SIT_VBLOCKS(raw_sit) > sbi->blocks_per_seg); @@ -560,9 > +561,19 @@ static inline void check_block_count(struct f2fs_sb_info > +*sbi, > BUG_ON(segno > end_segno); > > /* check bitmap with valid block count */ > - for (i = 0; i < sbi->blocks_per_seg; i++) > - if (f2fs_test_bit(i, raw_sit->valid_map)) > - valid_blocks++; > + do { > + if (is_valid) { > + next_pos = > find_next_zero_bit_le(&raw_sit->valid_map, > + sbi->blocks_per_seg, > + cur_pos); > + valid_blocks += next_pos - cur_pos; > + } else > + next_pos = find_next_bit_le(&raw_sit->valid_map, > + sbi->blocks_per_seg, > + cur_pos); > + cur_pos = next_pos; > + is_valid = !is_valid; > + } while (cur_pos < sbi->blocks_per_seg); > BUG_ON(GET_SIT_VBLOCKS(raw_sit) != valid_blocks); } > > -- > 1.7.9.5 > > > ---------------------------------------------------------------------------- > -- > Android is increasing in popularity, but the open development platform that > developers love is also attractive to malware creators. Download this white > paper to learn more about secure code signing practices that can help > keep Android apps secure. > http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.c > lktr > k > _______________________________________________ > Linux-f2fs-devel mailing list > Linux-f2fs-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel