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Message-ID: <Y9ljvM5aLxgpK3ZF@google.com>
Date: Tue, 31 Jan 2023 10:53:48 -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, kernel test robot <lkp@...el.com>,
Dan Carpenter <error27@...il.com>
Subject: Re: [PATCH v3 2/2] f2fs: use iostat_lat_type directly as a parameter
in the iostat_update_and_unbind_ctx()
On 01/31, Chao Yu wrote:
> On 2023/1/21 0:16, 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.
> >
> > Reported-by: kernel test robot <lkp@...el.com>
> > Reported-by: Dan Carpenter <error27@...il.com>
> > Signed-off-by: Yangtao Li <frank.li@...o.com>
> > ---
> > v3:
> > -convert to f2fs_warn()
> > fs/f2fs/data.c | 4 ++--
> > fs/f2fs/iostat.c | 39 ++++++++++++++++-----------------------
> > fs/f2fs/iostat.h | 19 ++++++++++---------
> > 3 files changed, 28 insertions(+), 34 deletions(-)
> >
> > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> > index 1645b8a1b904..710d4acde187 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 +330,7 @@ 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);
> > 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 96637756eae8..c767a2e7d5a9 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;
> > @@ -210,53 +209,47 @@ 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 lat_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;
> > - } else if (iotype >= NR_PAGE_TYPE) {
> > - f2fs_warn(sbi, "%s: %d over NR_PAGE_TYPE", __func__, iotype);
> > + if (page_type == META_FLUSH) {
> > + page_type = META;
> > + } else if (page_type >= NR_PAGE_TYPE) {
> > + f2fs_warn(sbi, "%s: %d over NR_PAGE_TYPE", __func__, page_type);
> > return;
> > }
> > - if (rw == 0) {
> > - idx = READ_IO;
> > - } else {
> > - if (is_sync)
> > - idx = WRITE_SYNC_IO;
> > - else
> > - idx = WRITE_ASYNC_IO;
> > + if (lat_type >= MAX_IO_TYPE) {
> > + f2fs_warn(sbi, "%s: %d over MAX_IO_TYPE", __func__, lat_type);
> > + return;
> > }
> > 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[lat_type][page_type] += ts_diff;
> > + io_lat->bio_cnt[lat_type][page_type]++;
> > + if (ts_diff > io_lat->peak_lat[lat_type][page_type])
> > + io_lat->peak_lat[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 lat_type)
> > {
> > struct bio_iostat_ctx *iostat_ctx = bio->bi_private;
> > - bool is_sync = bio->bi_opf & REQ_SYNC;
> > - if (rw == 0)
> > + if (lat_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, lat_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,
> > +};
>
> How about adjusting iostat_lat[{0,1,2}] to iostat_lat[{READ_IO,WRITE_SYNC_IO,WRITE_ASYNC_IO}]
> in tracepoint function.
>
> TP_fast_assign(
> __entry->dev = sbi->sb->s_dev;
> __entry->d_rd_peak = iostat_lat[0][DATA].peak_lat;
> __entry->d_rd_avg = iostat_lat[0][DATA].avg_lat;
> __entry->d_rd_cnt = iostat_lat[0][DATA].cnt;
> __entry->n_rd_peak = iostat_lat[0][NODE].peak_lat;
> __entry->n_rd_avg = iostat_lat[0][NODE].avg_lat;
> __entry->n_rd_cnt = iostat_lat[0][NODE].cnt;
> __entry->m_rd_peak = iostat_lat[0][META].peak_lat;
> __entry->m_rd_avg = iostat_lat[0][META].avg_lat;
> __entry->m_rd_cnt = iostat_lat[0][META].cnt;
> __entry->d_wr_s_peak = iostat_lat[1][DATA].peak_lat;
> __entry->d_wr_s_avg = iostat_lat[1][DATA].avg_lat;
> __entry->d_wr_s_cnt = iostat_lat[1][DATA].cnt;
> __entry->n_wr_s_peak = iostat_lat[1][NODE].peak_lat;
> __entry->n_wr_s_avg = iostat_lat[1][NODE].avg_lat;
> __entry->n_wr_s_cnt = iostat_lat[1][NODE].cnt;
> __entry->m_wr_s_peak = iostat_lat[1][META].peak_lat;
> __entry->m_wr_s_avg = iostat_lat[1][META].avg_lat;
> __entry->m_wr_s_cnt = iostat_lat[1][META].cnt;
> __entry->d_wr_as_peak = iostat_lat[2][DATA].peak_lat;
> __entry->d_wr_as_avg = iostat_lat[2][DATA].avg_lat;
> __entry->d_wr_as_cnt = iostat_lat[2][DATA].cnt;
> __entry->n_wr_as_peak = iostat_lat[2][NODE].peak_lat;
> __entry->n_wr_as_avg = iostat_lat[2][NODE].avg_lat;
> __entry->n_wr_as_cnt = iostat_lat[2][NODE].cnt;
> __entry->m_wr_as_peak = iostat_lat[2][META].peak_lat;
> __entry->m_wr_as_avg = iostat_lat[2][META].avg_lat;
> __entry->m_wr_as_cnt = iostat_lat[2][META].cnt;
> ),
Yangtao,
Could you please send another patch to address the Choa's suggestion?
Thanks,
>
> Thanks,
>
> > +
> > #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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