From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754519Ab3J2Kwv (ORCPT ); Tue, 29 Oct 2013 06:52:51 -0400 Received: from mailout1.samsung.com ([203.254.224.24]:44586 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752331Ab3J2Kwu (ORCPT ); Tue, 29 Oct 2013 06:52:50 -0400 X-AuditID: cbfee61a-b7f836d0000025d7-04-526f93808072 From: Chao Yu To: "'Changman Lee'" , 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> In-reply-to: <002a01ced479$925505e0$b6ff11a0$@samsung.com> Subject: RE: [f2fs-dev] [PATCH V2 RESEND] f2fs: check all ones or zeros bitmap with bitops for better mount performance Date: Tue, 29 Oct 2013 18:51:59 +0800 Message-id: <002401ced495$01a50290$04ef07b0$@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: AQJDVWMDlPIi5BHzS0Bii3fNyqKrlQE3RkV6mRjDBbA= Content-language: zh-cn X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrJLMWRmVeSWpSXmKPExsVy+t9jAd2GyflBBs/nCllc29fIZHF9118m i0uL3C327D3JYnF51xw2B1aP3Qs+M3n0bVnF6PF5k1wAcxSXTUpqTmZZapG+XQJXRsex+UwF B2Urnv09wtzAOFWii5GTQ0LARGLq6tksELaYxIV769lAbCGBRYwSPcdUuxi5gOwfjBJz23vY QRJsAioSyzv+M4HYIgLOElP/7mYGsZkFMiXmvJ7MCtGcKdF/uh1sKKeAlcSv2wsZQWxhgUqJ XfPngvWyCKhK3Nl+CWwZr4ClxNvHKxkhbEGJH5PvsUDM1JJYv/M4E4QtL7F5zVtmiEMVJHac fQ1UzwF0g5XEuSXiECXiEhuP3GKZwCg0C8mkWUgmzUIyaRaSlgWMLKsYRVMLkguKk9JzDfWK E3OLS/PS9ZLzczcxgiPgmdQOxpUNFocYBTgYlXh4HzDnBwmxJpYVV+YeYpTgYFYS4TXvAgrx piRWVqUW5ccXleakFh9ilOZgURLnPdBqHSgkkJ5YkpqdmlqQWgSTZeLglGpgXOi3yKBnf7XL lstm7CbpljmSjz3uhvpNWapw69S/9nmLmVh/8YYbHz75tcnP8rWzy+lDwVUPzb48nzmlzeyy 7vJ97j/3J17a81X79A/eg+9fzLkeKrtp/nfTlToXblud3vhr6c5Djoxnz+5syskTuvn0JVv+ dpkkIb4P81+mKJSF7BQ5HsS/6KsSS3FGoqEWc1FxIgDQHnaefAIAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.clktr > k > _______________________________________________ > Linux-f2fs-devel mailing list > Linux-f2fs-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel