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charset="utf-8" This patch introduces a tracepoint to monitor discard thread behaviors. Signed-off-by: Yangtao Li --- fs/f2fs/segment.c | 3 +++ include/trace/events/f2fs.h | 28 ++++++++++++++++++++++++++++ 2 files changed, 31 insertions(+) diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 641bd8cc54da..e27ad310186c 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -1839,6 +1839,9 @@ static int issue_discard_thread(void *data) if (!atomic_read(&dcc->discard_cmd_cnt)) wait_ms =3D dpolicy.max_interval; =20 + trace_f2fs_discard_thread(sbi->sb, wait_ms, dcc->undiscard_blks, + atomic_read(&dcc->discard_cmd_cnt)); + sb_end_intwrite(sbi->sb); =20 } while (!kthread_should_stop()); diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h index 99cbc5949e3c..e1939427deb2 100644 --- a/include/trace/events/f2fs.h +++ b/include/trace/events/f2fs.h @@ -1512,6 +1512,34 @@ DEFINE_EVENT(f2fs_discard, f2fs_remove_discard, TP_ARGS(dev, blkstart, blklen) ); =20 +TRACE_EVENT(f2fs_discard_thread, + + TP_PROTO(struct super_block *sb, unsigned int wait_ms, + unsigned int undiscard_blks, unsigned int discard_cmd_cnt), + + TP_ARGS(sb, wait_ms, undiscard_blks, discard_cmd_cnt), + + TP_STRUCT__entry( + __field(dev_t, dev) + __field(unsigned int, wait_ms) + __field(unsigned int, undiscard_blks) + __field(unsigned int, discard_cmd_cnt) + ), + + TP_fast_assign( + __entry->dev =3D sb->s_dev; + __entry->wait_ms =3D wait_ms; + __entry->undiscard_blks =3D undiscard_blks; + __entry->discard_cmd_cnt =3D discard_cmd_cnt; + ), + + TP_printk("dev =3D (%d,%d), wait_ms =3D %u, undiscard_blks =3D %u, discar= d_cmd_cnt =3D %u", + show_dev(__entry->dev), + __entry->wait_ms, + __entry->undiscard_blks, + __entry->discard_cmd_cnt) +); + TRACE_EVENT(f2fs_issue_reset_zone, =20 TP_PROTO(struct block_device *dev, block_t blkstart), --=20 2.39.0