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btrfs: enable a tracepoint when we fail tickets

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When debugging early enospc problems it was useful to have a tracepoint
where we failed all tickets so I could check the state of the enospc
counters at failure time to validate my fixes.  This adds the tracpoint
so you can easily get that information.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2021-07-14 14:47:19 -04:00 committed by David Sterba
parent 8197766d80
commit fcdef39c03
2 changed files with 8 additions and 0 deletions
fs/btrfs
space-info.c
include/trace/events
btrfs.h

2
fs/btrfs/space-info.c
View File

@ -824,6 +824,8 @@ static bool maybe_fail_all_tickets(struct btrfs_fs_info *fs_info,
struct reserve_ticket *ticket;
u64 tickets_id = space_info->tickets_id;
trace_btrfs_fail_all_tickets(fs_info, space_info);
if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
btrfs_info(fs_info, "cannot satisfy tickets, dumping space info");
__btrfs_dump_space_info(fs_info, space_info);

6
include/trace/events/btrfs.h
View File

@ -2104,6 +2104,12 @@ DEFINE_EVENT(btrfs_dump_space_info, btrfs_done_preemptive_reclaim,
TP_ARGS(fs_info, sinfo)
);
DEFINE_EVENT(btrfs_dump_space_info, btrfs_fail_all_tickets,
TP_PROTO(struct btrfs_fs_info *fs_info,
const struct btrfs_space_info *sinfo),
TP_ARGS(fs_info, sinfo)
);
TRACE_EVENT(btrfs_reserve_ticket,
TP_PROTO(const struct btrfs_fs_info *fs_info, u64 flags, u64 bytes,
u64 start_ns, int flush, int error),