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h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ZIq2ukc5kVKUSZ+gxHhSfKpQOGIZv/wynX+FZ2VTmG+R7PG+8jnH0p2mBl2zmsbHC +IwIwR3Brwzbe024M0lqa4AIo8wjpNFXjrgI9J9Y27e9v9RQigBXM9x3MRtuavSS1Z +hue6VisSfH1tXYeuuuhEsRDJPJenVaUA73rYQon8XZ5oWKcAawl4X67aRHCgQ35k9 zGcu9LzqIa3L76OZa4jDJsVqr2Hy5OT7wg1fejSyvSJqLOQOtlq/6iIBBn5ifr+Lw3 dIXEbyPWwYsCe+849pkIq5oXWq9CyDl8wyOxte+3Rb9pP7bryMMbJ3dV4+4sCPlBNI 4HXC2qNjbKTiw== Date: Tue, 23 May 2023 18:19:44 -0700 From: Jaegeuk Kim To: Daejun Park Message-ID: References: <20230508081042epcms2p8a637deae7de1829f54614e09d5fde5e5@epcms2p8> <20230511052416epcms2p617838faa71a203da6978c89ffd216e91@epcms2p6> <20230518020801epcms2p717775d12022c5371fbe9dcdf226efd4c@epcms2p7> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230518020801epcms2p717775d12022c5371fbe9dcdf226efd4c@epcms2p7> X-Headers-End: 1q1dAT-0004te-1W Subject: Re: [f2fs-dev] (2) (2) [PATCH v6] f2fs: add async reset zone command support X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "linux-kernel@vger.kernel.org" , "rostedt@goodmis.org" , "linux-f2fs-devel@lists.sourceforge.net" , "mhiramat@kernel.org" , Seokhwan Kim , beomsu kim , "linux-trace-kernel@vger.kernel.org" Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net T24gMDUvMTgsIERhZWp1biBQYXJrIHdyb3RlOgo+ID4gT24gMDUvMTEsIERhZWp1biBQYXJrIHdy b3RlOgo+ID4gPiA+IFNlbmRlciA6IEphZWdldWsgS2ltwqA8amFlZ2V1a0BrZXJuZWwub3JnPgo+ ID4gPiA+IERhdGUgOiAyMDIzLTA1LTEwIDAzOjUzIChHTVQrOSkKPiA+ID4gPiBUaXRsZSA6IFJl OiBbUEFUQ0ggdjZdIGYyZnM6IGFkZCBhc3luYyByZXNldCB6b25lIGNvbW1hbmQgc3VwcG9ydAo+ ID4gPiA+IFRvIDog67CV64yA7KSAPGRhZWp1bjcucGFya0BzYW1zdW5nLmNvbT4KPiA+ID4gPiBD QyA6IGNoYW9Aa2VybmVsLm9yZzxjaGFvQGtlcm5lbC5vcmc+LCByb3N0ZWR0QGdvb2RtaXMub3Jn PHJvc3RlZHRAZ29vZG1pcy5vcmc+LCBtaGlyYW1hdEBrZXJuZWwub3JnPG1oaXJhbWF0QGtlcm5l 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from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 28487126; Tue, 23 May 2023 18:19:48 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9F726637AE; Wed, 24 May 2023 01:19:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9053FC4339B; Wed, 24 May 2023 01:19:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1684891187; bh=vgMUJ0JPuqX3GxrYfWAArh7Rs47vUDfarxjvge6QVMU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ZIq2ukc5kVKUSZ+gxHhSfKpQOGIZv/wynX+FZ2VTmG+R7PG+8jnH0p2mBl2zmsbHC +IwIwR3Brwzbe024M0lqa4AIo8wjpNFXjrgI9J9Y27e9v9RQigBXM9x3MRtuavSS1Z +hue6VisSfH1tXYeuuuhEsRDJPJenVaUA73rYQon8XZ5oWKcAawl4X67aRHCgQ35k9 zGcu9LzqIa3L76OZa4jDJsVqr2Hy5OT7wg1fejSyvSJqLOQOtlq/6iIBBn5ifr+Lw3 dIXEbyPWwYsCe+849pkIq5oXWq9CyDl8wyOxte+3Rb9pP7bryMMbJ3dV4+4sCPlBNI 4HXC2qNjbKTiw== Date: Tue, 23 May 2023 18:19:44 -0700 From: Jaegeuk Kim To: Daejun Park Cc: "chao@kernel.org" , "rostedt@goodmis.org" , "mhiramat@kernel.org" , "linux-f2fs-devel@lists.sourceforge.net" , "linux-kernel@vger.kernel.org" , "linux-trace-kernel@vger.kernel.org" , Seokhwan Kim , Yonggil Song , beomsu kim Subject: Re: (2) (2) [PATCH v6] f2fs: add async reset zone command support Message-ID: References: <20230508081042epcms2p8a637deae7de1829f54614e09d5fde5e5@epcms2p8> <20230511052416epcms2p617838faa71a203da6978c89ffd216e91@epcms2p6> <20230518020801epcms2p717775d12022c5371fbe9dcdf226efd4c@epcms2p7> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20230518020801epcms2p717775d12022c5371fbe9dcdf226efd4c@epcms2p7> Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org On 05/18, Daejun Park wrote: > > On 05/11, Daejun Park wrote: > > > > Sender : Jaegeuk Kim  > > > > Date : 2023-05-10 03:53 (GMT+9) > > > > Title : Re: [PATCH v6] f2fs: add async reset zone command support > > > > To : 박대준 > > > > CC : chao@kernel.org, rostedt@goodmis.org, mhiramat@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, 김석환, 송용길, 김범수 > > > >   > > > > On 05/08, Daejun Park wrote: > > > > > v5 -> v6 > > > > > Added trace_f2fs_iostat support for zone reset command. > > > > > > > > > > v4 -> v5 > > > > > Added f2fs iostat for zone reset command. > > > > > > > > > > v3 -> v4 > > > > > Fixed build error caused by unused function. > > > > > > > > > > v2 -> v3 > > > > > Modified arguments to be correct for ftrace parameter. > > > > > Changed __submit_zone_reset_cmd to void return. > > > > > Refactored the f2fs_wait_discard_bio function. > > > > > Fixed code that was previously incorrectly merged. > > > > > > > > > > v1 -> v2 > > > > > Changed to apply the optional async reset write pointer by default. > > > > > > > > Don't add the history in the patch description. > > > > > > OK, I will do. > > > > > > > > > > > > > This patch enables submit reset zone command asynchornously. It helps > > > > > decrease average latency of write IOs in high utilization scenario by > > > > > faster checkpointing. > > > > > > > > > > Signed-off-by: Daejun Park > > > > > --- > > > > >  fs/f2fs/f2fs.h              |  1 + > > > > >  fs/f2fs/iostat.c            |  1 + > > > > >  fs/f2fs/segment.c           | 84 +++++++++++++++++++++++++++++++++++-- > > > > >  include/trace/events/f2fs.h | 24 +++++++++-- > > > > >  4 files changed, 104 insertions(+), 6 deletions(-) > > > > > > > > > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > > > > > index d211ee89c158..51b68a629814 100644 > > > > > --- a/fs/f2fs/f2fs.h > > > > > +++ b/fs/f2fs/f2fs.h > > > > > @@ -1175,6 +1175,7 @@ enum iostat_type { > > > > >          /* other */ > > > > >          FS_DISCARD_IO,                        /* discard */ > > > > >          FS_FLUSH_IO,                        /* flush */ > > > > > +        FS_ZONE_RESET_IO,                /* zone reset */ > > > > >          NR_IO_TYPE, > > > > >  }; > > > > >   > > > > > diff --git a/fs/f2fs/iostat.c b/fs/f2fs/iostat.c > > > > > index 3d5bfb1ad585..f8703038e1d8 100644 > > > > > --- a/fs/f2fs/iostat.c > > > > > +++ b/fs/f2fs/iostat.c > > > > > @@ -80,6 +80,7 @@ int __maybe_unused iostat_info_seq_show(struct seq_file *seq, void *offset) > > > > >          seq_puts(seq, "[OTHER]\n"); > > > > >          IOSTAT_INFO_SHOW("fs discard", FS_DISCARD_IO); > > > > >          IOSTAT_INFO_SHOW("fs flush", FS_FLUSH_IO); > > > > > +        IOSTAT_INFO_SHOW("fs zone reset", FS_ZONE_RESET_IO); > > > > >   > > > > >          return 0; > > > > >  } > > > > > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c > > > > > index 6db410f1bb8c..4802b05a795b 100644 > > > > > --- a/fs/f2fs/segment.c > > > > > +++ b/fs/f2fs/segment.c > > > > > @@ -1196,6 +1196,45 @@ static void __init_discard_policy(struct f2fs_sb_info *sbi, > > > > >  static void __update_discard_tree_range(struct f2fs_sb_info *sbi, > > > > >                                  struct block_device *bdev, block_t lstart, > > > > >                                  block_t start, block_t len); > > > > > + > > > > > +#ifdef CONFIG_BLK_DEV_ZONED > > > > > +static void __submit_zone_reset_cmd(struct f2fs_sb_info *sbi, > > > > > > > > Why can't we use __f2fs_issue_discard_zone()? > > > > > > In my understanding, __f2fs_issue_discard_zone is used to queue the zone reset command. > > > Which point do you think is the issue? > > > > That actually calls blkdev_zone_mgmt() which is doing the same thing. > > f2fs_clear_prefree_segments -> f2fs_issue_discard -> __issue_discard_async -> __f2fs_issue_discard_zone > In the case of discard in the existing code, discard can be queued by __queue_discard_cmd(). However the reset command is issued immediately. > > In this patch, I changed the zone reset command can be queued like discard command. > Therefore, I changed __f2fs_issue_discard_zone() to queue the reset command, and to issue the reset command through __submit_discard_cmd() -> __submit_zone_reset_cmd(). > > Also, in blkdev_zone_mgmt(), bi_end_io cannot be specified, so waiting in f2fs_wait_discard_bio() is not possible. > That's why I created a new __submit_zone_reset_cmd(). Hmm, I was thinking whether there's any chance to reuse __queue_discard_cmd() in __issue_discard_async() for the zone_reset command. Let me take a look at in another view. > > > > > > > > > > > > > > > +                                   struct discard_cmd *dc, blk_opf_t flag, > > > > > +                                   struct list_head *wait_list, > > > > > +                                   unsigned int *issued) > > > > > +{ > > > > > +        struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info; > > > > > +        struct block_device *bdev = dc->bdev; > > > > > +        struct bio *bio = bio_alloc(bdev, 0, REQ_OP_ZONE_RESET | flag, GFP_NOFS); > > > > > +        unsigned long flags; > > > > > + > > > > > +        trace_f2fs_issue_reset_zone(bdev, dc->di.start); > > > > > + > > > > > +        spin_lock_irqsave(&dc->lock, flags); > > > > > +        dc->state = D_SUBMIT; > > > > > +        dc->bio_ref++; > > > > > +        spin_unlock_irqrestore(&dc->lock, flags); > > > > > + > > > > > +        if (issued) > > > > > +                (*issued)++; > > > > > + > > > > > +        atomic_inc(&dcc->queued_discard); > > > > > +        dc->queued++; > > > > > +        list_move_tail(&dc->list, wait_list); > > > > > + > > > > > +        /* sanity check on discard range */ > > > > > +        __check_sit_bitmap(sbi, dc->di.lstart, dc->di.lstart + dc->di.len); > > > > > + > > > > > +        bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(dc->di.start); > > > > > +        bio->bi_private = dc; > > > > > +        bio->bi_end_io = f2fs_submit_discard_endio; > > > > > +        submit_bio(bio); > > > > > + > > > > > +        atomic_inc(&dcc->issued_discard); > > > > > +        f2fs_update_iostat(sbi, NULL, FS_ZONE_RESET_IO, dc->di.len * F2FS_BLKSIZE); > > > > > +} > > > > > +#endif > > > > > + > > > > >  /* this function is copied from blkdev_issue_discard from block/blk-lib.c */ > > > > >  static int __submit_discard_cmd(struct f2fs_sb_info *sbi, > > > > >                                  struct discard_policy *dpolicy, > > > > > @@ -1217,6 +1256,13 @@ static int __submit_discard_cmd(struct f2fs_sb_info *sbi, > > > > >          if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) > > > > >                  return 0; > > > > >   > > > > > +#ifdef CONFIG_BLK_DEV_ZONED > > > > > +        if (f2fs_sb_has_blkzoned(sbi) && bdev_is_zoned(bdev)) { > > > > > +                __submit_zone_reset_cmd(sbi, dc, flag, wait_list, issued); > > > > > +                return 0; > > > > > +        } > > > > > +#endif > > > > > + > > > > >          trace_f2fs_issue_discard(bdev, dc->di.start, dc->di.len); > > > > >   > > > > >          lstart = dc->di.lstart; > > > > > @@ -1461,6 +1507,19 @@ static void __update_discard_tree_range(struct f2fs_sb_info *sbi, > > > > >          } > > > > >  } > > > > >   > > > > > +#ifdef CONFIG_BLK_DEV_ZONED > > > > > +static void __queue_zone_reset_cmd(struct f2fs_sb_info *sbi, > > > > > +                struct block_device *bdev, block_t blkstart, block_t lblkstart, > > > > > +                block_t blklen) > > > > > +{ > > > > > +        trace_f2fs_queue_reset_zone(bdev, blkstart); > > > > > + > > > > > +        mutex_lock(&SM_I(sbi)->dcc_info->cmd_lock); > > > > > +        __insert_discard_cmd(sbi, bdev, lblkstart, blkstart, blklen); > > > > > +        mutex_unlock(&SM_I(sbi)->dcc_info->cmd_lock); > > > > > +} > > > > > +#endif > > > > > + > > > > >  static void __queue_discard_cmd(struct f2fs_sb_info *sbi, > > > > >                  struct block_device *bdev, block_t blkstart, block_t blklen) > > > > >  { > > > > > @@ -1724,6 +1783,19 @@ static void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr) > > > > >   > > > > >          mutex_lock(&dcc->cmd_lock); > > > > >          dc = __lookup_discard_cmd(sbi, blkaddr); > > > > > +#ifdef CONFIG_BLK_DEV_ZONED > > > > > +        if (dc && f2fs_sb_has_blkzoned(sbi) && bdev_is_zoned(dc->bdev)) { > > > > > +                /* force submit zone reset */ > > > > > +                if (dc->state == D_PREP) > > > > > +                        __submit_zone_reset_cmd(sbi, dc, REQ_SYNC, > > > > > +                                                &dcc->wait_list, NULL); > > > > > +                dc->ref++; > > > > > +                mutex_unlock(&dcc->cmd_lock); > > > > > +                /* wait zone reset */ > > > > > +                __wait_one_discard_bio(sbi, dc); > > > > > +                return; > > > > > +        } > > > > > +#endif > > > > >          if (dc) { > > > > >                  if (dc->state == D_PREP) { > > > > >                          __punch_discard_cmd(sbi, dc, blkaddr); > > > > > @@ -1876,9 +1948,15 @@ static int __f2fs_issue_discard_zone(struct f2fs_sb_info *sbi, > > > > >                                   blkstart, blklen); > > > > >                          return -EIO; > > > > >                  } > > > > > -                trace_f2fs_issue_reset_zone(bdev, blkstart); > > > > > -                return blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET, > > > > > -                                        sector, nr_sects, GFP_NOFS); > > > > > + > > > > > +                if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING))) { > > > > > +                        trace_f2fs_issue_reset_zone(bdev, blkstart); > > > > > +                        return blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET, > > > > > +                                                sector, nr_sects, GFP_NOFS); > > > > > +                } > > > > > + > > > > > +                __queue_zone_reset_cmd(sbi, bdev, blkstart, lblkstart, blklen); > > > > > +                return 0; > > > > >          } > > > > >   > > > > >          /* For conventional zones, use regular discard if supported */ > > > > > diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h > > > > > index 99cbc5949e3c..793f82cc1515 100644 > > > > > --- a/include/trace/events/f2fs.h > > > > > +++ b/include/trace/events/f2fs.h > > > > > @@ -1512,7 +1512,7 @@ DEFINE_EVENT(f2fs_discard, f2fs_remove_discard, > > > > >          TP_ARGS(dev, blkstart, blklen) > > > > >  ); > > > > >   > > > > > -TRACE_EVENT(f2fs_issue_reset_zone, > > > > > +DECLARE_EVENT_CLASS(f2fs_reset_zone, > > > > >   > > > > >          TP_PROTO(struct block_device *dev, block_t blkstart), > > > > >   > > > > > @@ -1528,11 +1528,25 @@ TRACE_EVENT(f2fs_issue_reset_zone, > > > > >                  __entry->blkstart = blkstart; > > > > >          ), > > > > >   > > > > > -        TP_printk("dev = (%d,%d), reset zone at block = 0x%llx", > > > > > +        TP_printk("dev = (%d,%d), zone at block = 0x%llx", > > > > >                  show_dev(__entry->dev), > > > > >                  (unsigned long long)__entry->blkstart) > > > > >  ); > > > > >   > > > > > +DEFINE_EVENT(f2fs_reset_zone, f2fs_queue_reset_zone, > > > > > + > > > > > +        TP_PROTO(struct block_device *dev, block_t blkstart), > > > > > + > > > > > +        TP_ARGS(dev, blkstart) > > > > > +); > > > > > + > > > > > +DEFINE_EVENT(f2fs_reset_zone, f2fs_issue_reset_zone, > > > > > + > > > > > +        TP_PROTO(struct block_device *dev, block_t blkstart), > > > > > + > > > > > +        TP_ARGS(dev, blkstart) > > > > > +); > > > > > + > > > > >  TRACE_EVENT(f2fs_issue_flush, > > > > >   > > > > >          TP_PROTO(struct block_device *dev, unsigned int nobarrier, > > > > > @@ -1979,6 +1993,7 @@ TRACE_EVENT(f2fs_iostat, > > > > >                  __field(unsigned long long,        fs_nrio) > > > > >                  __field(unsigned long long,        fs_mrio) > > > > >                  __field(unsigned long long,        fs_discard) > > > > > +                __field(unsigned long long,        fs_reset_zone) > > > > >          ), > > > > >   > > > > >          TP_fast_assign( > > > > > @@ -2010,12 +2025,14 @@ TRACE_EVENT(f2fs_iostat, > > > > >                  __entry->fs_nrio        = iostat[FS_NODE_READ_IO]; > > > > >                  __entry->fs_mrio        = iostat[FS_META_READ_IO]; > > > > >                  __entry->fs_discard        = iostat[FS_DISCARD_IO]; > > > > > +                __entry->fs_reset_zone        = iostat[FS_ZONE_RESET_IO]; > > > > >          ), > > > > >   > > > > >          TP_printk("dev = (%d,%d), " > > > > >                  "app [write=%llu (direct=%llu, buffered=%llu), mapped=%llu, " > > > > >                  "compr(buffered=%llu, mapped=%llu)], " > > > > > -                "fs [data=%llu, cdata=%llu, node=%llu, meta=%llu, discard=%llu], " > > > > > +                "fs [data=%llu, cdata=%llu, node=%llu, meta=%llu, discard=%llu, " > > > > > +                "reset_zone=%llu], " > > > > >                  "gc [data=%llu, node=%llu], " > > > > >                  "cp [data=%llu, node=%llu, meta=%llu], " > > > > >                  "app [read=%llu (direct=%llu, buffered=%llu), mapped=%llu], " > > > > > @@ -2026,6 +2043,7 @@ TRACE_EVENT(f2fs_iostat, > > > > >                  __entry->app_bio, __entry->app_mio, __entry->app_bcdio, > > > > >                  __entry->app_mcdio, __entry->fs_dio, __entry->fs_cdio, > > > > >                  __entry->fs_nio, __entry->fs_mio, __entry->fs_discard, > > > > > +                __entry->fs_reset_zone, > > > > >                  __entry->fs_gc_dio, __entry->fs_gc_nio, __entry->fs_cp_dio, > > > > >                  __entry->fs_cp_nio, __entry->fs_cp_mio, > > > > >                  __entry->app_rio, __entry->app_drio, __entry->app_brio, > > > > > -- > > > > > 2.25.1 >