Messages in this thread Patch in this message |  | | Date | Mon, 13 Aug 2018 13:11:50 -0700 | From | Jaegeuk Kim <> | Subject | Re: [f2fs-dev] [PATCH v3] f2fs: fix performance issue observed with multi-thread sequential read |
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On 08/13, Chao Yu wrote: > Hi Jaegeuk, > > On 2018/8/11 2:56, Jaegeuk Kim wrote: > > This reverts the commit - "b93f771 - f2fs: remove writepages lock" > > to fix the drop in sequential read throughput. > > > > Test: ./tiotest -t 32 -d /data/tio_tmp -f 32 -b 524288 -k 1 -k 3 -L > > device: UFS > > > > Before - > > read throughput: 185 MB/s > > total read requests: 85177 (of these ~80000 are 4KB size requests). > > total write requests: 2546 (of these ~2208 requests are written in 512KB). > > > > After - > > read throughput: 758 MB/s > > total read requests: 2417 (of these ~2042 are 512KB reads). > > total write requests: 2701 (of these ~2034 requests are written in 512KB). > > IMO, it only impact sequential read performance in a large file which may be > fragmented during multi-thread writing. > > In android environment, mostly, the large file should be cold type, such as apk, > mp3, rmvb, jpeg..., so I think we only need to serialize writepages() for cold > data area writer. > > So how about adding a mount option to serialize writepage() for different type > of log, e.g. in android, using serialize=4; by default, using serialize=7 > HOT_DATA 1 > WARM_DATA 2 > COLD_DATA 4
Well, I don't think we need to give too many mount options for this fragmented case. How about doing this for the large files only like this?
From 4fea0b6e4da8512a72dd52afc7a51beb35966ad9 Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim <jaegeuk@kernel.org> Date: Thu, 9 Aug 2018 17:53:34 -0700 Subject: [PATCH] f2fs: fix performance issue observed with multi-thread sequential read
This reverts the commit - "b93f771 - f2fs: remove writepages lock" to fix the drop in sequential read throughput.
Test: ./tiotest -t 32 -d /data/tio_tmp -f 32 -b 524288 -k 1 -k 3 -L device: UFS
Before - read throughput: 185 MB/s total read requests: 85177 (of these ~80000 are 4KB size requests). total write requests: 2546 (of these ~2208 requests are written in 512KB).
After - read throughput: 758 MB/s total read requests: 2417 (of these ~2042 are 512KB reads). total write requests: 2701 (of these ~2034 requests are written in 512KB).
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> --- Documentation/ABI/testing/sysfs-fs-f2fs | 8 ++++++++ fs/f2fs/data.c | 10 ++++++++++ fs/f2fs/f2fs.h | 2 ++ fs/f2fs/segment.c | 1 + fs/f2fs/super.c | 1 + fs/f2fs/sysfs.c | 2 ++ 6 files changed, 24 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index 9b0123388f18..94a24aedcdb2 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -51,6 +51,14 @@ Description: Controls the dirty page count condition for the in-place-update policies. +What: /sys/fs/f2fs/<disk>/min_seq_blocks +Date: August 2018 +Contact: "Jaegeuk Kim" <jaegeuk@kernel.org> +Description: + Controls the dirty page count condition for batched sequential + writes in ->writepages. + + What: /sys/fs/f2fs/<disk>/min_hot_blocks Date: March 2017 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 45f043ee48bd..f09231b1cc74 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -2132,6 +2132,7 @@ static int __f2fs_write_data_pages(struct address_space *mapping, struct f2fs_sb_info *sbi = F2FS_I_SB(inode); struct blk_plug plug; int ret; + bool locked = false; /* deal with chardevs and other special file */ if (!mapping->a_ops->writepage) @@ -2162,10 +2163,19 @@ static int __f2fs_write_data_pages(struct address_space *mapping, else if (atomic_read(&sbi->wb_sync_req[DATA])) goto skip_write; + if (!S_ISDIR(inode->i_mode) && + get_dirty_pages(inode) <= SM_I(sbi)->min_seq_blocks) { + mutex_lock(&sbi->writepages); + locked = true; + } + blk_start_plug(&plug); ret = f2fs_write_cache_pages(mapping, wbc, io_type); blk_finish_plug(&plug); + if (locked) + mutex_unlock(&sbi->writepages); + if (wbc->sync_mode == WB_SYNC_ALL) atomic_dec(&sbi->wb_sync_req[DATA]); /* diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 375aa9f30cfa..098bdedc28bf 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -913,6 +913,7 @@ struct f2fs_sm_info { unsigned int ipu_policy; /* in-place-update policy */ unsigned int min_ipu_util; /* in-place-update threshold */ unsigned int min_fsync_blocks; /* threshold for fsync */ + unsigned int min_seq_blocks; /* threshold for sequential blocks */ unsigned int min_hot_blocks; /* threshold for hot block allocation */ unsigned int min_ssr_sections; /* threshold to trigger SSR allocation */ @@ -1133,6 +1134,7 @@ struct f2fs_sb_info { struct rw_semaphore sb_lock; /* lock for raw super block */ int valid_super_block; /* valid super block no */ unsigned long s_flag; /* flags for sbi */ + struct mutex writepages; /* mutex for writepages() */ #ifdef CONFIG_BLK_DEV_ZONED unsigned int blocks_per_blkz; /* F2FS blocks per zone */ diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 63fc647f9ac2..ffea2d1303bd 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -4131,6 +4131,7 @@ int f2fs_build_segment_manager(struct f2fs_sb_info *sbi) sm_info->ipu_policy = 1 << F2FS_IPU_FSYNC; sm_info->min_ipu_util = DEF_MIN_IPU_UTIL; sm_info->min_fsync_blocks = DEF_MIN_FSYNC_BLOCKS; + sm_info->min_seq_blocks = sbi->blocks_per_seg * sbi->segs_per_sec; sm_info->min_hot_blocks = DEF_MIN_HOT_BLOCKS; sm_info->min_ssr_sections = reserved_sections(sbi); diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index be41dbd7b261..53d70b64fea1 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -2842,6 +2842,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) /* init f2fs-specific super block info */ sbi->valid_super_block = valid_super_block; mutex_init(&sbi->gc_mutex); + mutex_init(&sbi->writepages); mutex_init(&sbi->cp_mutex); init_rwsem(&sbi->node_write); init_rwsem(&sbi->node_change); diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index cd2e030e47b8..81c0e5337443 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -397,6 +397,7 @@ F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections); F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy); F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util); F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks); +F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_seq_blocks, min_seq_blocks); F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_hot_blocks, min_hot_blocks); F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ssr_sections, min_ssr_sections); F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh); @@ -449,6 +450,7 @@ static struct attribute *f2fs_attrs[] = { ATTR_LIST(ipu_policy), ATTR_LIST(min_ipu_util), ATTR_LIST(min_fsync_blocks), + ATTR_LIST(min_seq_blocks), ATTR_LIST(min_hot_blocks), ATTR_LIST(min_ssr_sections), ATTR_LIST(max_victim_search), -- 2.17.0.441.gb46fe60e1d-goog
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