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Message-ID: <20131225032320.GB23505@gmail.com> Date: Wed, 25 Dec 2013 11:23:20 +0800 From: Zheng Liu <gnehzuil.liu@...il.com> To: Jan Kara <jack@...e.cz> Cc: linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>, Andreas Dilger <adilger.kernel@...ger.ca>, Zheng Liu <wenqing.lz@...bao.com> Subject: Re: [RFC PATCH 1/2] ext4: improve extents status tree trace point On Mon, Dec 23, 2013 at 09:39:03AM +0100, Jan Kara wrote: > On Fri 20-12-13 18:42:44, Zheng Liu wrote: > > 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. > Umm, I think you can use a generic 'function trace' infrastructure to > trace entry & exit into arbitrary functions in kernel. So there shouldn't > be a need to introduce extra entry & exit tracepoints. Ah, thanks for reminding me. Yes, 'function trace' is extreme useful! - Zheng > > Honza > > > 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 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > > the body of a message to majordomo@...r.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- > Jan Kara <jack@...e.cz> > SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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