From 4b02b00fe5f1377f3dbfb168dfcfebf3d7a9632f Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Fri, 9 Oct 2020 09:28:28 -0400 Subject: [PATCH] btrfs: adjust the flush trace point to include the source Since we have normal ticketed flushing and preemptive flushing, adjust the tracepoint so that we know the source of the flushing action to make it easier to debug problems. Reviewed-by: Nikolay Borisov Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/space-info.c | 17 +++++++++-------- include/trace/events/btrfs.h | 10 ++++++---- 2 files changed, 15 insertions(+), 12 deletions(-) diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c index e8acf08..bb4f85c0 100644 --- a/fs/btrfs/space-info.c +++ b/fs/btrfs/space-info.c @@ -673,7 +673,7 @@ enospc: */ static void flush_space(struct btrfs_fs_info *fs_info, struct btrfs_space_info *space_info, u64 num_bytes, - enum btrfs_flush_state state) + enum btrfs_flush_state state, bool for_preempt) { struct btrfs_root *root = fs_info->extent_root; struct btrfs_trans_handle *trans; @@ -756,7 +756,7 @@ static void flush_space(struct btrfs_fs_info *fs_info, } trace_btrfs_flush_space(fs_info, space_info->flags, num_bytes, state, - ret); + ret, for_preempt); return; } @@ -997,7 +997,7 @@ static void btrfs_async_reclaim_metadata_space(struct work_struct *work) flush_state = FLUSH_DELAYED_ITEMS_NR; do { - flush_space(fs_info, space_info, to_reclaim, flush_state); + flush_space(fs_info, space_info, to_reclaim, flush_state, false); spin_lock(&space_info->lock); if (list_empty(&space_info->tickets)) { space_info->flush = 0; @@ -1132,7 +1132,7 @@ static void btrfs_preempt_reclaim_metadata_space(struct work_struct *work) to_reclaim >>= 2; if (!to_reclaim) to_reclaim = btrfs_calc_insert_metadata_size(fs_info, 1); - flush_space(fs_info, space_info, to_reclaim, flush); + flush_space(fs_info, space_info, to_reclaim, flush, true); cond_resched(); spin_lock(&space_info->lock); } @@ -1223,7 +1223,7 @@ static void btrfs_async_reclaim_data_space(struct work_struct *work) spin_unlock(&space_info->lock); while (!space_info->full) { - flush_space(fs_info, space_info, U64_MAX, ALLOC_CHUNK_FORCE); + flush_space(fs_info, space_info, U64_MAX, ALLOC_CHUNK_FORCE, false); spin_lock(&space_info->lock); if (list_empty(&space_info->tickets)) { space_info->flush = 0; @@ -1236,7 +1236,7 @@ static void btrfs_async_reclaim_data_space(struct work_struct *work) while (flush_state < ARRAY_SIZE(data_flush_states)) { flush_space(fs_info, space_info, U64_MAX, - data_flush_states[flush_state]); + data_flush_states[flush_state], false); spin_lock(&space_info->lock); if (list_empty(&space_info->tickets)) { space_info->flush = 0; @@ -1309,7 +1309,8 @@ static void priority_reclaim_metadata_space(struct btrfs_fs_info *fs_info, flush_state = 0; do { - flush_space(fs_info, space_info, to_reclaim, states[flush_state]); + flush_space(fs_info, space_info, to_reclaim, states[flush_state], + false); flush_state++; spin_lock(&space_info->lock); if (ticket->bytes == 0) { @@ -1325,7 +1326,7 @@ static void priority_reclaim_data_space(struct btrfs_fs_info *fs_info, struct reserve_ticket *ticket) { while (!space_info->full) { - flush_space(fs_info, space_info, U64_MAX, ALLOC_CHUNK_FORCE); + flush_space(fs_info, space_info, U64_MAX, ALLOC_CHUNK_FORCE, false); spin_lock(&space_info->lock); if (ticket->bytes == 0) { spin_unlock(&space_info->lock); diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h index 8a7c163..807921d 100644 --- a/include/trace/events/btrfs.h +++ b/include/trace/events/btrfs.h @@ -1113,15 +1113,16 @@ TRACE_EVENT(btrfs_trigger_flush, TRACE_EVENT(btrfs_flush_space, TP_PROTO(const struct btrfs_fs_info *fs_info, u64 flags, u64 num_bytes, - int state, int ret), + int state, int ret, bool for_preempt), - TP_ARGS(fs_info, flags, num_bytes, state, ret), + TP_ARGS(fs_info, flags, num_bytes, state, ret, for_preempt), TP_STRUCT__entry_btrfs( __field( u64, flags ) __field( u64, num_bytes ) __field( int, state ) __field( int, ret ) + __field( bool, for_preempt ) ), TP_fast_assign_btrfs(fs_info, @@ -1129,15 +1130,16 @@ TRACE_EVENT(btrfs_flush_space, __entry->num_bytes = num_bytes; __entry->state = state; __entry->ret = ret; + __entry->for_preempt = for_preempt; ), - TP_printk_btrfs("state=%d(%s) flags=%llu(%s) num_bytes=%llu ret=%d", + TP_printk_btrfs("state=%d(%s) flags=%llu(%s) num_bytes=%llu ret=%d for_preempt=%d", __entry->state, __print_symbolic(__entry->state, FLUSH_STATES), __entry->flags, __print_flags((unsigned long)__entry->flags, "|", BTRFS_GROUP_FLAGS), - __entry->num_bytes, __entry->ret) + __entry->num_bytes, __entry->ret, __entry->for_preempt) ); DECLARE_EVENT_CLASS(btrfs__reserved_extent, -- 2.7.4