From c337e7b02f71c4b2f6f2138807a284d2c4e1ac5e Mon Sep 17 00:00:00 2001
From: Qu Wenruo <wqu@suse.com>
Date: Thu, 27 Sep 2018 14:42:29 +0800
Patch-mainline: v4.19
Git-commit: c337e7b02f71c4b2f6f2138807a284d2c4e1ac5e
References: bsc#1063638 dependency
Subject: [PATCH 1/6] btrfs: qgroup: Introduce trace event to analyse the
number of dirty extents accounted
Number of qgroup dirty extents is directly linked to the performance
overhead, so add a new trace event, trace_qgroup_num_dirty_extents(), to
record how many dirty extents is processed in
btrfs_qgroup_account_extents().
This will be pretty handy to analyze later balance performance
improvement.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
fs/btrfs/qgroup.c | 4 ++++
include/trace/events/btrfs.h | 21 +++++++++++++++++++++
2 files changed, 25 insertions(+)
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -2081,6 +2081,7 @@ int btrfs_qgroup_account_extents(struct
struct btrfs_delayed_ref_root *delayed_refs;
struct ulist *new_roots = NULL;
struct rb_node *node;
+ u64 num_dirty_extents = 0;
u64 qgroup_to_skip;
int ret = 0;
@@ -2090,6 +2091,7 @@ int btrfs_qgroup_account_extents(struct
record = rb_entry(node, struct btrfs_qgroup_extent_record,
node);
+ num_dirty_extents++;
trace_btrfs_qgroup_account_extents(fs_info, record);
if (!ret) {
@@ -2134,6 +2136,8 @@ cleanup:
kfree(record);
}
+ trace_qgroup_num_dirty_extents(fs_info, trans->transid,
+ num_dirty_extents);
return ret;
}
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -1582,6 +1582,27 @@ DEFINE_EVENT(btrfs_qgroup_extent, btrfs_
TP_ARGS(fs_info, rec)
);
+TRACE_EVENT(qgroup_num_dirty_extents,
+
+ TP_PROTO(const struct btrfs_fs_info *fs_info, u64 transid,
+ u64 num_dirty_extents),
+
+ TP_ARGS(fs_info, transid, num_dirty_extents),
+
+ TP_STRUCT__entry_btrfs(
+ __field( u64, transid )
+ __field( u64, num_dirty_extents )
+ ),
+
+ TP_fast_assign_btrfs(fs_info,
+ __entry->transid = transid;
+ __entry->num_dirty_extents = num_dirty_extents;
+ ),
+
+ TP_printk_btrfs("transid=%llu num_dirty_extents=%llu",
+ __entry->transid, __entry->num_dirty_extents)
+);
+
TRACE_EVENT(btrfs_qgroup_account_extent,
TP_PROTO(const struct btrfs_fs_info *fs_info, u64 bytenr,