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authorQu Wenruo <wqu@suse.com>2022-06-01 17:46:59 +0800
committerDavid Sterba <dsterba@suse.com>2022-07-25 17:44:34 +0200
commitb8bea09a456fc31af8f10029e69d105cac7e530e (patch)
tree55edff30cb5945aeca9751900ed8c7a8668b6694 /include/trace
parent4d10046613333508d31fe926c545c8c0b620508a (diff)
downloadlinux-b8bea09a456fc31af8f10029e69d105cac7e530e.tar.gz
btrfs: add trace event for submitted RAID56 bio
Add tracepoint for better insight to how the RAID56 data are submitted. The output looks like this: (trace event header and UUID skipped) raid56_read_partial: full_stripe=389152768 devid=3 type=DATA1 offset=32768 opf=0x0 physical=323059712 len=32768 raid56_read_partial: full_stripe=389152768 devid=1 type=DATA2 offset=0 opf=0x0 physical=67174400 len=65536 raid56_write_stripe: full_stripe=389152768 devid=3 type=DATA1 offset=0 opf=0x1 physical=323026944 len=32768 raid56_write_stripe: full_stripe=389152768 devid=2 type=PQ1 offset=0 opf=0x1 physical=323026944 len=32768 The above debug output is from a 32K data write into an empty RAID56 data chunk. Some explanation on the event output: full_stripe: the logical bytenr of the full stripe devid: btrfs devid type: raid stripe type. DATA1: the first data stripe DATA2: the second data stripe PQ1: the P stripe PQ2: the Q stripe offset: the offset inside the stripe. opf: the bio op type physical: the physical offset the bio is for len: the length of the bio The first two lines are from partial RMW read, which is reading the remaining data stripes from disks. The last two lines are for full stripe RMW write, which is writing the involved two 16K stripes (one for DATA1 stripe, one for P stripe). The stripe for DATA2 doesn't need to be written. There are 5 types of trace events: - raid56_read_partial Read remaining data for regular read/write path. - raid56_write_stripe Write the modified stripes for regular read/write path. - raid56_scrub_read_recover Read remaining data for scrub recovery path. - raid56_scrub_write_stripe Write the modified stripes for scrub path. - raid56_scrub_read Read remaining data for scrub path. Also, since the trace events are included at super.c, we have to export needed structure definitions to 'raid56.h' and include the header in super.c, or we're unable to access those members. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> [ reformat comments ] Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/btrfs.h94
1 files changed, 94 insertions, 0 deletions
diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index 9ae94ef3e270..29fa8ea2cc0f 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -30,6 +30,8 @@ struct btrfs_qgroup;
struct extent_io_tree;
struct prelim_ref;
struct btrfs_space_info;
+struct btrfs_raid_bio;
+struct raid56_bio_trace_info;
#define show_ref_type(type) \
__print_symbolic(type, \
@@ -2258,6 +2260,98 @@ DEFINE_EVENT(btrfs__space_info_update, update_bytes_pinned,
TP_ARGS(fs_info, sinfo, old, diff)
);
+DECLARE_EVENT_CLASS(btrfs_raid56_bio,
+
+ TP_PROTO(const struct btrfs_raid_bio *rbio,
+ const struct bio *bio,
+ const struct raid56_bio_trace_info *trace_info),
+
+ TP_ARGS(rbio, bio, trace_info),
+
+ TP_STRUCT__entry_btrfs(
+ __field( u64, full_stripe )
+ __field( u64, physical )
+ __field( u64, devid )
+ __field( u32, offset )
+ __field( u32, len )
+ __field( u8, opf )
+ __field( u8, total_stripes )
+ __field( u8, real_stripes )
+ __field( u8, nr_data )
+ __field( u8, stripe_nr )
+ ),
+
+ TP_fast_assign_btrfs(rbio->bioc->fs_info,
+ __entry->full_stripe = rbio->bioc->raid_map[0];
+ __entry->physical = bio->bi_iter.bi_sector << SECTOR_SHIFT;
+ __entry->len = bio->bi_iter.bi_size;
+ __entry->opf = bio_op(bio);
+ __entry->devid = trace_info->devid;
+ __entry->offset = trace_info->offset;
+ __entry->stripe_nr = trace_info->stripe_nr;
+ __entry->total_stripes = rbio->bioc->num_stripes;
+ __entry->real_stripes = rbio->real_stripes;
+ __entry->nr_data = rbio->nr_data;
+ ),
+ /*
+ * For type output, we need to output things like "DATA1"
+ * (the first data stripe), "DATA2" (the second data stripe),
+ * "PQ1" (P stripe),"PQ2" (Q stripe), "REPLACE0" (replace target device).
+ */
+ TP_printk_btrfs(
+"full_stripe=%llu devid=%lld type=%s%d offset=%d opf=0x%x physical=%llu len=%u",
+ __entry->full_stripe, __entry->devid,
+ (__entry->stripe_nr < __entry->nr_data) ? "DATA" :
+ ((__entry->stripe_nr < __entry->real_stripes) ? "PQ" :
+ "REPLACE"),
+ (__entry->stripe_nr < __entry->nr_data) ?
+ (__entry->stripe_nr + 1) :
+ ((__entry->stripe_nr < __entry->real_stripes) ?
+ (__entry->stripe_nr - __entry->nr_data + 1) : 0),
+ __entry->offset, __entry->opf, __entry->physical, __entry->len)
+);
+
+DEFINE_EVENT(btrfs_raid56_bio, raid56_read_partial,
+ TP_PROTO(const struct btrfs_raid_bio *rbio,
+ const struct bio *bio,
+ const struct raid56_bio_trace_info *trace_info),
+
+ TP_ARGS(rbio, bio, trace_info)
+);
+
+DEFINE_EVENT(btrfs_raid56_bio, raid56_write_stripe,
+ TP_PROTO(const struct btrfs_raid_bio *rbio,
+ const struct bio *bio,
+ const struct raid56_bio_trace_info *trace_info),
+
+ TP_ARGS(rbio, bio, trace_info)
+);
+
+
+DEFINE_EVENT(btrfs_raid56_bio, raid56_scrub_write_stripe,
+ TP_PROTO(const struct btrfs_raid_bio *rbio,
+ const struct bio *bio,
+ const struct raid56_bio_trace_info *trace_info),
+
+ TP_ARGS(rbio, bio, trace_info)
+);
+
+DEFINE_EVENT(btrfs_raid56_bio, raid56_scrub_read,
+ TP_PROTO(const struct btrfs_raid_bio *rbio,
+ const struct bio *bio,
+ const struct raid56_bio_trace_info *trace_info),
+
+ TP_ARGS(rbio, bio, trace_info)
+);
+
+DEFINE_EVENT(btrfs_raid56_bio, raid56_scrub_read_recover,
+ TP_PROTO(const struct btrfs_raid_bio *rbio,
+ const struct bio *bio,
+ const struct raid56_bio_trace_info *trace_info),
+
+ TP_ARGS(rbio, bio, trace_info)
+);
+
#endif /* _TRACE_BTRFS_H */
/* This part must be outside protection */