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writeback: Add tracepoint to track pending inode switches

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Add trace_inode_switch_wbs_queue tracepoint to allow insight into how
many inodes are queued to switch their bdi_writeback structure.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Jan Kara
2025-09-19 13:11:06 +02:00
committed by Christian Brauner
parent 9a6ebbdbd4
commit 0cee64c547
2 changed files with 31 additions and 0 deletions
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fs/fs-writeback.c
+2
View File
@@ -667,6 +667,7 @@ static void inode_switch_wbs(struct inode *inode, int new_wb_id)
isw->inodes[0] = inode;
trace_inode_switch_wbs_queue(inode->i_wb, new_wb, 1);
wb_queue_isw(new_wb, isw);
return;
@@ -752,6 +753,7 @@ bool cleanup_offline_cgwb(struct bdi_writeback *wb)
return restart;
}
trace_inode_switch_wbs_queue(wb, new_wb, nr);
wb_queue_isw(new_wb, isw);
return restart;
include/trace/events/writeback.h
+29
View File
@@ -213,6 +213,35 @@ TRACE_EVENT(inode_foreign_history,
)
);
TRACE_EVENT(inode_switch_wbs_queue,
TP_PROTO(struct bdi_writeback *old_wb, struct bdi_writeback *new_wb,
unsigned int count),
TP_ARGS(old_wb, new_wb, count),
TP_STRUCT__entry(
__array(char, name, 32)
__field(ino_t, old_cgroup_ino)
__field(ino_t, new_cgroup_ino)
__field(unsigned int, count)
),
TP_fast_assign(
strscpy_pad(__entry->name, bdi_dev_name(old_wb->bdi), 32);
__entry->old_cgroup_ino = __trace_wb_assign_cgroup(old_wb);
__entry->new_cgroup_ino = __trace_wb_assign_cgroup(new_wb);
__entry->count = count;
),
TP_printk("bdi %s: old_cgroup_ino=%lu new_cgroup_ino=%lu count=%u",
__entry->name,
(unsigned long)__entry->old_cgroup_ino,
(unsigned long)__entry->new_cgroup_ino,
__entry->count
)
);
TRACE_EVENT(inode_switch_wbs,
TP_PROTO(struct inode *inode, struct bdi_writeback *old_wb,