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Message-ID: <Y9g4PcQvsCOj1d0r@google.com> Date: Mon, 30 Jan 2023 13:35:57 -0800 From: Jaegeuk Kim <jaegeuk@...nel.org> To: Chao Yu <chao@...nel.org> Cc: Yangtao Li <frank.li@...o.com>, linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org Subject: Re: [PATCH] f2fs: use iostat_lat_type directly as a parameter in the iostat_update_and_unbind_ctx() On 01/28, Chao Yu wrote: > On 2023/1/5 12:22, Yangtao Li wrote: > > Convert to use iostat_lat_type as parameter instead of raw number. > > BTW, move NUM_PREALLOC_IOSTAT_CTXS to the header file, and rename > > iotype to page_type to match the definition. > > > > Signed-off-by: Yangtao Li <frank.li@...o.com> > > --- > > fs/f2fs/data.c | 5 +++-- > > fs/f2fs/iostat.c | 34 +++++++++++----------------------- > > fs/f2fs/iostat.h | 19 ++++++++++--------- > > 3 files changed, 24 insertions(+), 34 deletions(-) > > > > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c > > index c940da1c540f..4e8fd5697c42 100644 > > --- a/fs/f2fs/data.c > > +++ b/fs/f2fs/data.c > > @@ -292,7 +292,7 @@ static void f2fs_read_end_io(struct bio *bio) > > struct bio_post_read_ctx *ctx; > > bool intask = in_task(); > > - iostat_update_and_unbind_ctx(bio, 0); > > + iostat_update_and_unbind_ctx(bio, READ_IO); > > ctx = bio->bi_private; > > if (time_to_inject(sbi, FAULT_READ_IO)) > > @@ -330,7 +330,8 @@ static void f2fs_write_end_io(struct bio *bio) > > struct bio_vec *bvec; > > struct bvec_iter_all iter_all; > > - iostat_update_and_unbind_ctx(bio, 1); > > + iostat_update_and_unbind_ctx(bio, bio->bi_opf & REQ_SYNC ? WRITE_SYNC_IO : > > + WRITE_ASYNC_IO); > > We can use op_is_write(bio_op(bio)) to check IO's rw type, why not just > passing bio arguement, and parse rw/sync types from bio inside > iostat_update_and_unbind_ctx(), it can avoid passing unneeded arguements. Chao, let's write another patch to clean up, if you're interested in. > > Thanks, > > > sbi = bio->bi_private; > > if (time_to_inject(sbi, FAULT_WRITE_IO)) > > diff --git a/fs/f2fs/iostat.c b/fs/f2fs/iostat.c > > index 59c72f92191a..20944c4a683a 100644 > > --- a/fs/f2fs/iostat.c > > +++ b/fs/f2fs/iostat.c > > @@ -14,7 +14,6 @@ > > #include "iostat.h" > > #include <trace/events/f2fs.h> > > -#define NUM_PREALLOC_IOSTAT_CTXS 128 > > static struct kmem_cache *bio_iostat_ctx_cache; > > static mempool_t *bio_iostat_ctx_pool; > > @@ -210,49 +209,38 @@ void f2fs_update_iostat(struct f2fs_sb_info *sbi, struct inode *inode, > > } > > static inline void __update_iostat_latency(struct bio_iostat_ctx *iostat_ctx, > > - int rw, bool is_sync) > > + enum iostat_lat_type type) > > { > > unsigned long ts_diff; > > - unsigned int iotype = iostat_ctx->type; > > + unsigned int page_type = iostat_ctx->type; > > struct f2fs_sb_info *sbi = iostat_ctx->sbi; > > struct iostat_lat_info *io_lat = sbi->iostat_io_lat; > > - int idx; > > unsigned long flags; > > if (!sbi->iostat_enable) > > return; > > ts_diff = jiffies - iostat_ctx->submit_ts; > > - if (iotype >= META_FLUSH) > > - iotype = META; > > - > > - if (rw == 0) { > > - idx = READ_IO; > > - } else { > > - if (is_sync) > > - idx = WRITE_SYNC_IO; > > - else > > - idx = WRITE_ASYNC_IO; > > - } > > + if (page_type >= META_FLUSH) > > + page_type = META; > > spin_lock_irqsave(&sbi->iostat_lat_lock, flags); > > - io_lat->sum_lat[idx][iotype] += ts_diff; > > - io_lat->bio_cnt[idx][iotype]++; > > - if (ts_diff > io_lat->peak_lat[idx][iotype]) > > - io_lat->peak_lat[idx][iotype] = ts_diff; > > + io_lat->sum_lat[type][page_type] += ts_diff; > > + io_lat->bio_cnt[type][page_type]++; > > + if (ts_diff > io_lat->peak_lat[type][page_type]) > > + io_lat->peak_lat[type][page_type] = ts_diff; > > spin_unlock_irqrestore(&sbi->iostat_lat_lock, flags); > > } > > -void iostat_update_and_unbind_ctx(struct bio *bio, int rw) > > +void iostat_update_and_unbind_ctx(struct bio *bio, enum iostat_lat_type type) > > { > > struct bio_iostat_ctx *iostat_ctx = bio->bi_private; > > - bool is_sync = bio->bi_opf & REQ_SYNC; > > - if (rw == 0) > > + if (type == READ_IO) > > bio->bi_private = iostat_ctx->post_read_ctx; > > else > > bio->bi_private = iostat_ctx->sbi; > > - __update_iostat_latency(iostat_ctx, rw, is_sync); > > + __update_iostat_latency(iostat_ctx, type); > > mempool_free(iostat_ctx, bio_iostat_ctx_pool); > > } > > diff --git a/fs/f2fs/iostat.h b/fs/f2fs/iostat.h > > index 2c048307b6e0..1f827a2fe6b2 100644 > > --- a/fs/f2fs/iostat.h > > +++ b/fs/f2fs/iostat.h > > @@ -8,20 +8,21 @@ > > struct bio_post_read_ctx; > > +enum iostat_lat_type { > > + READ_IO = 0, > > + WRITE_SYNC_IO, > > + WRITE_ASYNC_IO, > > + MAX_IO_TYPE, > > +}; > > + > > #ifdef CONFIG_F2FS_IOSTAT > > +#define NUM_PREALLOC_IOSTAT_CTXS 128 > > #define DEFAULT_IOSTAT_PERIOD_MS 3000 > > #define MIN_IOSTAT_PERIOD_MS 100 > > /* maximum period of iostat tracing is 1 day */ > > #define MAX_IOSTAT_PERIOD_MS 8640000 > > -enum { > > - READ_IO, > > - WRITE_SYNC_IO, > > - WRITE_ASYNC_IO, > > - MAX_IO_TYPE, > > -}; > > - > > struct iostat_lat_info { > > unsigned long sum_lat[MAX_IO_TYPE][NR_PAGE_TYPE]; /* sum of io latencies */ > > unsigned long peak_lat[MAX_IO_TYPE][NR_PAGE_TYPE]; /* peak io latency */ > > @@ -57,7 +58,7 @@ static inline struct bio_post_read_ctx *get_post_read_ctx(struct bio *bio) > > return iostat_ctx->post_read_ctx; > > } > > -extern void iostat_update_and_unbind_ctx(struct bio *bio, int rw); > > +extern void iostat_update_and_unbind_ctx(struct bio *bio, enum iostat_lat_type type); > > extern void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi, > > struct bio *bio, struct bio_post_read_ctx *ctx); > > extern int f2fs_init_iostat_processing(void); > > @@ -67,7 +68,7 @@ extern void f2fs_destroy_iostat(struct f2fs_sb_info *sbi); > > #else > > static inline void f2fs_update_iostat(struct f2fs_sb_info *sbi, struct inode *inode, > > enum iostat_type type, unsigned long long io_bytes) {} > > -static inline void iostat_update_and_unbind_ctx(struct bio *bio, int rw) {} > > +static inline void iostat_update_and_unbind_ctx(struct bio *bio, enum iostat_lat_type type) {} > > static inline void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi, > > struct bio *bio, struct bio_post_read_ctx *ctx) {} > > static inline void iostat_update_submit_ctx(struct bio *bio,
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