From patchwork Tue Jun 18 05:42:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chaitanya Kulkarni X-Patchwork-Id: 11001015 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 563A676 for ; Tue, 18 Jun 2019 07:04:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 46E49288E8 for ; Tue, 18 Jun 2019 07:04:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 39989288D3; Tue, 18 Jun 2019 07:04:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 53686288D3 for ; Tue, 18 Jun 2019 07:04:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726643AbfFRHEK (ORCPT ); Tue, 18 Jun 2019 03:04:10 -0400 Received: from esa3.hgst.iphmx.com ([216.71.153.141]:7915 "EHLO esa3.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725829AbfFRHEK (ORCPT ); Tue, 18 Jun 2019 03:04:10 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1560841450; x=1592377450; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=DYP0IhPlDbDvmFFl2HcXvA2JQRtUY8p81IhbJHsjHZ8=; b=f6mZM0EwxPK8q+j0m6CoyzIKHC0kK/9HZyqGryouS0VcC0p2TZ8q1xIJ FZ+zZJl3K1BkDDc5pGKMAA9u7dGfsnIlPNbvfKc9gS0k9e/TF+hGF3ii6 7RM9xxaTEn7SCHlA7jJJzX1nPQSm8k6Jm0tvF8/Mvz1EH9MRVA+rbKHp4 n0U37uFEcNW7P5FLpFLL8dUlN120aJVN9gHvbJQ68RIxfdGd+UqTfUwPJ pDvZTbrXGR8+ZIMN33/ppfPLd1QJvLvhDcSAvkzq/bf4FdJ4RSrnmPv6u zBky5esCMsU9ZX704krrIRsY2JIBJz9YQb0OcDIOpICXRiTVrXIi28Msr Q==; X-IronPort-AV: E=Sophos;i="5.63,388,1557158400"; d="scan'208";a="115733424" Received: from uls-op-cesaip02.wdc.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 18 Jun 2019 13:42:26 +0800 IronPort-SDR: b5ukUqnvwJzIMUBtTTWdc+vETM7oOqJe18PDNB54i3NMGS1R9t526QCglSGmmZa36AdWgg5FnB nEnqJpJhqj1Oh6SNpSOSEQ5UQ6/jjJ8awz8CvsbqF6HalMPJ+mVevCUroRu7eOUDjFB5W8cRCm Y6ELfcxBUSqaZaVq5NbzQ97Z1a5PkthLmh8hUm/hiRPB2qtvMOqZEOBVG+NX4ZyC59D6J7JAjq sABiZ4oslQNAG1icoAAuAZ0Nz4rcACtgSGckn15w0yecjhO1gOaMHCEK2GXL0xfU+8rm79qjJ2 MGS4novQbRaxx1uG8DjBprxz Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep02.wdc.com with ESMTP; 17 Jun 2019 22:41:55 -0700 IronPort-SDR: FMtDrzWn/22TzFOcwOnVHgX1vPkKpEWF9yrxBtYDoIN7QNrs7FqrwgHTFsB5WQFhgQJdRzt1KO 8FcrI07kEb8/vJUR4OdGtBeMDXzSt5Xv//ly4YaEqx+f/XcmHci8I8lZV7RZMAbwFeb5b990+h jmCAklwbH8xHAtZd43IBsxCDOfT4M35vbd80YGOSr78yhSZoocwUTB4koqz4TnK5hV9OMWkWzB TyvLJvmm0g6H43ycrS63dyOapzzs0xTp9ZEwdyzCmd5xNXeTfYBsyvsLte4mdKzsyCWWLDhMRU LTk= Received: from cmercuryqemu.hgst.com ([10.202.65.32]) by uls-op-cesaip02.wdc.com with ESMTP; 17 Jun 2019 22:42:25 -0700 From: Chaitanya Kulkarni To: linux-block@vger.kernel.org Cc: jaegeuk@kernel.org, yuchao0@huawei.com, bvanassche@acm.org, Chaitanya Kulkarni Subject: [PATCH V3 0/6] block: improve print_req_error Date: Mon, 17 Jun 2019 22:42:18 -0700 Message-Id: <20190618054224.25985-1-chaitanya.kulkarni@wdc.com> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Hi, This patch-series is based on the initial patch posted by Christoph Hellwig . While debugging the driver and block layer this print message is very meaningful. Also, we centralize the REQ_OP_XXX to the string conversion in the blk-core.c so that other dependent subsystems can use this helper without having to duplicate the code e.g. f2fs, blk-mq-debugfs.c. Please consider this for 5.3. In case someone is interested please find the test log for print_err_req with null_blk, f2fs tracing and blk-mq-debugfs->blk_mq_debugfs_rq_show() at the end of this patch. Regards, Chaitanya Changes since V2:- 1. Add a centralized definition of the REQ_OP_XXX string array in the blk-core so that it will be available to other dependent subsystems as well. 2. Adjust the code and use blk_op_str() in the blk-mq-debugfs.c 3. Adjust the code and use blk_op_str() in the f2fs tracing. Chaitanya Kulkarni (5): block: add centralize REQ_OP_XXX to string helper block: use blk_op_str() in blk-mq-debugfs.c block: update print_req_error() f2fs: use block layer helper for REQ_OP_XXX f2fs: get rid of duplicate code for in tracing Christoph Hellwig (1): block: improve print_req_error block/blk-core.c | 55 ++++++++++++++++++++++++++++++++----- block/blk-mq-debugfs.c | 24 +++------------- include/linux/blkdev.h | 3 ++ include/trace/events/f2fs.h | 20 +++----------- 4 files changed, 59 insertions(+), 43 deletions(-) A. Following is the sample error message with forced REQ_OP_WRITE, REQ_OP_WRITE_ZEROES and REQ_OP_DISCARD failure from modified null_blk for testing :- ------------------------------------------------------------------ [ 489.013530] blk_update_request: I/O error, dev nullb0, sector 0 op 0x1:(WRITE) flags 0x8800 phys_seg 1 prio class 0 [ 510.569833] blk_update_request: I/O error, dev nullb0, sector 0 op 0x9:(WRITE_ZEROES) flags 0x400800 phys_seg 0 prio class 0 [ 557.009194] blk_update_request: I/O error, dev nullb0, sector 0 op 0x3:(DISCARD) flags 0x800 phys_seg 1 prio class 0 B. F2FS Tracing with this patch-series :- ----------------------------------------- # 1. Format and mount device with f2fs :- linux-block (for-next) # mkfs.f2fs -f /dev/nvme0n1 F2FS-tools: mkfs.f2fs Ver: 1.12.0 (2018-11-12) Info: format successful linux-block (for-next) # mount /dev/nvme0n1 /mnt/nvme0n1 # 2. Enable f2fs traces which are associated with the bio:- linux-block (for-next) # cat /sys/kernel/debug/tracing/events/f2fs/f2fs_prepare_read_bio/enable 1 linux-block (for-next) # cat /sys/kernel/debug/tracing/events/f2fs/f2fs_prepare_write_bio/enable 1 linux-block (for-next) # cat /sys/kernel/debug/tracing/events/f2fs/f2fs_submit_page_bio/enable 1 linux-block (for-next) # cat /sys/kernel/debug/tracing/events/f2fs/f2fs_submit_read_bio/enable 1 linux-block (for-next) # cat /sys/kernel/debug/tracing/events/f2fs/f2fs_submit_write_bio/enable 1 # 3. Issue I/O using dd(1) :- linux-block (for-next) # dd of=/mnt/nvme0n1/data if=/dev/zero bs=4k count=100 100+0 records in 100+0 records out 409600 bytes (410 kB) copied, 0.00315802 s, 130 MB/s linux-block (for-next) # linux-block (for-next) # # 4, Collect the trace linux-block (for-next) # cat /sys/kernel/debug/tracing/trace_pipe # 5. Following is the trimmed trace where we get rid of first few columns :- f2fs_trace_pid: 103: 0 1af2 dd f2fs_trace_ios: 103: 0 0 ---------------- 3 0 2000 1600 1 f2fs_trace_pid: 103: 0 1e8 kworker/u24:5 f2fs_prepare_write_bio: dev = (259,0)/(259,0), rw = WRITE(S), DATA, sector = 53256, size = 4096 f2fs_submit_write_bio: dev = (259,0)/(259,0), rw = WRITE(S), DATA, sector = 53256, size = 4096 f2fs_trace_ios: 103: 0 1ace ---------------- 1 1 800 1a01 1 f2fs_trace_ios: 103: 0 1e8 ---------------- 2 1 800 1401 1 f2fs_prepare_write_bio: dev = (259,0)/(259,0), rw = WRITE(S), NODE, sector = 40968, size = 4096 f2fs_submit_write_bio: dev = (259,0)/(259,0), rw = WRITE(S), NODE, sector = 40968, size = 4096 f2fs_prepare_write_bio: dev = (259,0)/(259,0), rw = WRITE(S), NODE, sector = 45056, size = 4096 f2fs_submit_write_bio: dev = (259,0)/(259,0), rw = WRITE(S), NODE, sector = 45056, size = 4096 f2fs_trace_ios: 103: 0 1ace ---------------- 2 1 800 1600 1 f2fs_prepare_write_bio: dev = (259,0)/(259,0), rw = WRITE(S|M|P), META, sector = 8192, size = 8192 f2fs_submit_write_bio: dev = (259,0)/(259,0), rw = WRITE(S|M|P), META, sector = 8192, size = 8192 f2fs_prepare_write_bio: dev = (259,0)/(259,0), rw = WRITE(S|M|P|PF|FUA), META_FLUSH, sector = 8208, size = 4096 f2fs_submit_write_bio: dev = (259,0)/(259,0), rw = WRITE(S|M|P|PF|FUA), META_FLUSH, sector = 8208, size = 4096 f2fs_trace_ios: 103: 0 1e8 ---------------- 3 1 3800 400 3 f2fs_prepare_write_bio: dev = (259,0)/(259,0), rw = WRITE(), DATA, sector = 53264, size = 40960 f2fs_submit_write_bio: dev = (259,0)/(259,0), rw = WRITE(), DATA, sector = 53264, size = 40960 f2fs_trace_pid: 103: 0 1b16 dd f2fs_trace_ios: 103: 0 1af2 ---------------- 0 1 100000 1a02 a f2fs_prepare_write_bio: dev = (259,0)/(259,0), rw = WRITE(), DATA, sector = 1064960, size = 409600 f2fs_submit_write_bio: dev = (259,0)/(259,0), rw = WRITE(), DATA, sector = 1064960, size = 409600 C. blk-mq-debugfs.c tests for __blk_mq_debugfs_rq_show() :- ----------------------------------------------------------- # 1. Issue write-zeroes, disacrd and write operation on the null_blk with modified null_blk @@ -1180,6 +1207,20 @@ static blk_status_t null_handle_cmd(struct nullb_cmd *cmd) } } + /* just discard for write zeroes for now */ + switch (req_op(cmd->rq)) { + case REQ_OP_DISCARD: + /* fall through */ + case REQ_OP_WRITE_ZEROES: + mdelay(10000); + break; + case REQ_OP_WRITE: + mdelay(10000); + } + linux-block (for-next) # blkdiscard -z -o 0 -l 40960 /dev/nullb0 linux-block (for-next) # blkdiscard -o 0 -l 40960 /dev/nullb0 linux-block (for-next) # dd if=/dev/zero of=/dev/nullb0 bs=4k count=1 oflag=direct #2. Read the hctx busy file every second, each type of request should be block for 10 seconds and must appear in the hctx->busy file in the debugfs. This will lead to from block/blk-mq-debugfs.c : {"busy", 0400, hctx_busy_show} hctx_show_busy_rq() __blk_mq_debugfs_rq_show() blk_op_str() linux-block (for-next) # while [ 1 ]; do cat /sys/kernel/debug/block/nullb0/hctx0/busy ; sleep 1; done 0000000095104d0a {.op=WRITE_ZEROES, .cmd_flags=SYNC|NOUNMAP, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=48, .internal_tag=96} 0000000095104d0a {.op=WRITE_ZEROES, .cmd_flags=SYNC|NOUNMAP, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=48, .internal_tag=96} 0000000095104d0a {.op=WRITE_ZEROES, .cmd_flags=SYNC|NOUNMAP, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=48, .internal_tag=96} 0000000095104d0a {.op=WRITE_ZEROES, .cmd_flags=SYNC|NOUNMAP, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=48, .internal_tag=96} 0000000095104d0a {.op=WRITE_ZEROES, .cmd_flags=SYNC|NOUNMAP, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=48, .internal_tag=96} 0000000095104d0a {.op=WRITE_ZEROES, .cmd_flags=SYNC|NOUNMAP, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=48, .internal_tag=96} 0000000095104d0a {.op=WRITE_ZEROES, .cmd_flags=SYNC|NOUNMAP, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=48, .internal_tag=96} 0000000095104d0a {.op=WRITE_ZEROES, .cmd_flags=SYNC|NOUNMAP, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=48, .internal_tag=96} 0000000095104d0a {.op=WRITE_ZEROES, .cmd_flags=SYNC|NOUNMAP, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=48, .internal_tag=96} 0000000095104d0a {.op=WRITE_ZEROES, .cmd_flags=SYNC|NOUNMAP, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=48, .internal_tag=96} 0000000051de04b0 {.op=DISCARD, .cmd_flags=SYNC, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=47} 0000000051de04b0 {.op=DISCARD, .cmd_flags=SYNC, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=47} 0000000051de04b0 {.op=DISCARD, .cmd_flags=SYNC, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=47} 0000000051de04b0 {.op=DISCARD, .cmd_flags=SYNC, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=47} 0000000051de04b0 {.op=DISCARD, .cmd_flags=SYNC, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=47} 0000000051de04b0 {.op=DISCARD, .cmd_flags=SYNC, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=47} 0000000051de04b0 {.op=DISCARD, .cmd_flags=SYNC, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=47} 0000000051de04b0 {.op=DISCARD, .cmd_flags=SYNC, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=47} 0000000051de04b0 {.op=DISCARD, .cmd_flags=SYNC, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=47} 0000000051de04b0 {.op=DISCARD, .cmd_flags=SYNC, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=47} 0000000037e18909 {.op=WRITE, .cmd_flags=SYNC|IDLE, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=97} 0000000037e18909 {.op=WRITE, .cmd_flags=SYNC|IDLE, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=97} 0000000037e18909 {.op=WRITE, .cmd_flags=SYNC|IDLE, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=97} 0000000037e18909 {.op=WRITE, .cmd_flags=SYNC|IDLE, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=97} 0000000037e18909 {.op=WRITE, .cmd_flags=SYNC|IDLE, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=97} 0000000037e18909 {.op=WRITE, .cmd_flags=SYNC|IDLE, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=97} 0000000037e18909 {.op=WRITE, .cmd_flags=SYNC|IDLE, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=97} 0000000037e18909 {.op=WRITE, .cmd_flags=SYNC|IDLE, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=97} 0000000037e18909 {.op=WRITE, .cmd_flags=SYNC|IDLE, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=97} 0000000037e18909 {.op=WRITE, .cmd_flags=SYNC|IDLE, .rq_flags=STARTED|ELVPRIV|IO_STAT|STATS, .state=in_flight, .tag=49, .internal_tag=97}