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Date: Fri, 20 Dec 2013 18:42:44 +0800
From: Zheng Liu <gnehzuil.liu@...il.com>
To: linux-ext4@...r.kernel.org
Cc: "Theodore Ts'o" <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>,
Zheng Liu <wenqing.lz@...bao.com>
Subject: [RFC PATCH 1/2] ext4: improve extents status tree trace point
From: Zheng Liu <wenqing.lz@...bao.com>
This commit improves the trace point of extents status tree. For
improving the shrinker, we need to collect more details from trace
point. First we put more enter/exit pairs in insertion, deletion,
and caching code path in order to collect the latency of these code
path. Then we rename trace_ext4_es_shrink_enter in ext4_es_count()
because it is also used in ext4_es_scan() and we don't identify
them from the result.
Cc: "Theodore Ts'o" <tytso@....edu>
Cc: Andreas Dilger <adilger.kernel@...ger.ca>
Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
---
fs/ext4/extents_status.c | 15 ++++++++------
include/trace/events/ext4.h | 46 ++++++++++++++++++++++++++++++++++++++-----
2 files changed, 50 insertions(+), 11 deletions(-)
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
index 3981ff7..e842d74 100644
--- a/fs/ext4/extents_status.c
+++ b/fs/ext4/extents_status.c
@@ -660,7 +660,7 @@ int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
newes.es_len = len;
ext4_es_store_pblock(&newes, pblk);
ext4_es_store_status(&newes, status);
- trace_ext4_es_insert_extent(inode, &newes);
+ trace_ext4_es_insert_extent_enter(inode, &newes);
ext4_es_insert_extent_check(inode, &newes);
@@ -678,6 +678,7 @@ retry:
error:
write_unlock(&EXT4_I(inode)->i_es_lock);
+ trace_ext4_es_insert_extent_exit(inode, &newes);
ext4_es_print_tree(inode);
@@ -701,7 +702,7 @@ void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
newes.es_len = len;
ext4_es_store_pblock(&newes, pblk);
ext4_es_store_status(&newes, status);
- trace_ext4_es_cache_extent(inode, &newes);
+ trace_ext4_es_cache_extent_enter(inode, &newes);
if (!len)
return;
@@ -714,6 +715,7 @@ void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
if (!es || es->es_lblk > end)
__es_insert_extent(inode, &newes);
write_unlock(&EXT4_I(inode)->i_es_lock);
+ trace_ext4_es_cache_extent_exit(inode, &newes);
}
/*
@@ -887,7 +889,7 @@ int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t end;
int err = 0;
- trace_ext4_es_remove_extent(inode, lblk, len);
+ trace_ext4_es_remove_extent_enter(inode, lblk, len);
es_debug("remove [%u/%u) from extent status tree of inode %lu\n",
lblk, len, inode->i_ino);
@@ -901,6 +903,7 @@ int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
err = __es_remove_extent(inode, lblk, end);
write_unlock(&EXT4_I(inode)->i_es_lock);
ext4_es_print_tree(inode);
+ trace_ext4_es_remove_extent_exit(inode, lblk, len);
return err;
}
@@ -1017,7 +1020,7 @@ static unsigned long ext4_es_count(struct shrinker *shrink,
sbi = container_of(shrink, struct ext4_sb_info, s_es_shrinker);
nr = percpu_counter_read_positive(&sbi->s_extent_cache_cnt);
- trace_ext4_es_shrink_enter(sbi->s_sb, sc->nr_to_scan, nr);
+ trace_ext4_es_shrink_count(sbi->s_sb, sc->nr_to_scan, nr);
return nr;
}
@@ -1030,14 +1033,14 @@ static unsigned long ext4_es_scan(struct shrinker *shrink,
int ret, nr_shrunk;
ret = percpu_counter_read_positive(&sbi->s_extent_cache_cnt);
- trace_ext4_es_shrink_enter(sbi->s_sb, nr_to_scan, ret);
+ trace_ext4_es_shrink_scan_enter(sbi->s_sb, nr_to_scan, ret);
if (!nr_to_scan)
return ret;
nr_shrunk = __ext4_es_shrink(sbi, nr_to_scan, NULL);
- trace_ext4_es_shrink_exit(sbi->s_sb, nr_shrunk, ret);
+ trace_ext4_es_shrink_scan_exit(sbi->s_sb, nr_shrunk, ret);
return nr_shrunk;
}
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index 197d312..8b3ff82 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -2221,19 +2221,31 @@ DECLARE_EVENT_CLASS(ext4__es_extent,
__entry->pblk, show_extent_status(__entry->status))
);
-DEFINE_EVENT(ext4__es_extent, ext4_es_insert_extent,
+DEFINE_EVENT(ext4__es_extent, ext4_es_insert_extent_enter,
TP_PROTO(struct inode *inode, struct extent_status *es),
TP_ARGS(inode, es)
);
-DEFINE_EVENT(ext4__es_extent, ext4_es_cache_extent,
+DEFINE_EVENT(ext4__es_extent, ext4_es_insert_extent_exit,
TP_PROTO(struct inode *inode, struct extent_status *es),
TP_ARGS(inode, es)
);
-TRACE_EVENT(ext4_es_remove_extent,
+DEFINE_EVENT(ext4__es_extent, ext4_es_cache_extent_enter,
+ TP_PROTO(struct inode *inode, struct extent_status *es),
+
+ TP_ARGS(inode, es)
+);
+
+DEFINE_EVENT(ext4__es_extent, ext4_es_cache_extent_exit,
+ TP_PROTO(struct inode *inode, struct extent_status *es),
+
+ TP_ARGS(inode, es)
+);
+
+DECLARE_EVENT_CLASS(ext4__es_remove_extent,
TP_PROTO(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len),
TP_ARGS(inode, lblk, len),
@@ -2258,6 +2270,18 @@ TRACE_EVENT(ext4_es_remove_extent,
__entry->lblk, __entry->len)
);
+DEFINE_EVENT(ext4__es_remove_extent, ext4_es_remove_extent_enter,
+ TP_PROTO(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len),
+
+ TP_ARGS(inode, lblk, len)
+);
+
+DEFINE_EVENT(ext4__es_remove_extent, ext4_es_remove_extent_exit,
+ TP_PROTO(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len),
+
+ TP_ARGS(inode, lblk, len)
+);
+
TRACE_EVENT(ext4_es_find_delayed_extent_range_enter,
TP_PROTO(struct inode *inode, ext4_lblk_t lblk),
@@ -2366,7 +2390,7 @@ TRACE_EVENT(ext4_es_lookup_extent_exit,
show_extent_status(__entry->found ? __entry->status : 0))
);
-TRACE_EVENT(ext4_es_shrink_enter,
+DECLARE_EVENT_CLASS(ext4__es_shrink_enter,
TP_PROTO(struct super_block *sb, int nr_to_scan, int cache_cnt),
TP_ARGS(sb, nr_to_scan, cache_cnt),
@@ -2388,7 +2412,19 @@ TRACE_EVENT(ext4_es_shrink_enter,
__entry->nr_to_scan, __entry->cache_cnt)
);
-TRACE_EVENT(ext4_es_shrink_exit,
+DEFINE_EVENT(ext4__es_shrink_enter, ext4_es_shrink_count,
+ TP_PROTO(struct super_block *sb, int nr_to_scan, int cache_cnt),
+
+ TP_ARGS(sb, nr_to_scan, cache_cnt)
+);
+
+DEFINE_EVENT(ext4__es_shrink_enter, ext4_es_shrink_scan_enter,
+ TP_PROTO(struct super_block *sb, int nr_to_scan, int cache_cnt),
+
+ TP_ARGS(sb, nr_to_scan, cache_cnt)
+);
+
+TRACE_EVENT(ext4_es_shrink_scan_exit,
TP_PROTO(struct super_block *sb, int shrunk_nr, int cache_cnt),
TP_ARGS(sb, shrunk_nr, cache_cnt),
--
1.7.9.7
--
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