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fs/fs-writeback.c: inode writeback list tracking tracepoints 

The per-sb inode writeback list tracks inodes currently under writeback
to facilitate efficient sync processing.  In particular, it ensures that
sync only needs to walk through a list of inodes that were cleaned by
the sync.

Add a couple tracepoints to help identify when inodes are added/removed
to and from the writeback lists.  Piggyback off of the writeback
lazytime tracepoint template as it already tracks the relevant inode
information.

Link: http://lkml.kernel.org/r/1466594593-6757-3-git-send-email-bfoster@redhat.com
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Dave Chinner <dchinner@redhat.com>
cc: Josef Bacik <jbacik@fb.com>
Cc: Holger Hoffstätte <holger.hoffstaette@applied-asynchrony.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Brian Foster 2016-07-26 15:21:53 -07:00 committed by Linus Torvalds
parent 6c60d2b574
commit 9a46b04f16
2 changed files with 25 additions and 6 deletions
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9
fs/fs-writeback.c
View File

@ -990,8 +990,10 @@ void sb_mark_inode_writeback(struct inode *inode)
if (list_empty(&inode->i_wb_list)) {
spin_lock_irqsave(&sb->s_inode_wblist_lock, flags);
if (list_empty(&inode->i_wb_list))
if (list_empty(&inode->i_wb_list)) {
list_add_tail(&inode->i_wb_list, &sb->s_inodes_wb);
trace_sb_mark_inode_writeback(inode);
}
spin_unlock_irqrestore(&sb->s_inode_wblist_lock, flags);
}
}
@ -1006,7 +1008,10 @@ void sb_clear_inode_writeback(struct inode *inode)
if (!list_empty(&inode->i_wb_list)) {
spin_lock_irqsave(&sb->s_inode_wblist_lock, flags);
list_del_init(&inode->i_wb_list);
if (!list_empty(&inode->i_wb_list)) {
list_del_init(&inode->i_wb_list);
trace_sb_clear_inode_writeback(inode);
}
spin_unlock_irqrestore(&sb->s_inode_wblist_lock, flags);
}
}

22
include/trace/events/writeback.h
View File

@ -696,7 +696,7 @@ DEFINE_EVENT(writeback_single_inode_template, writeback_single_inode,
TP_ARGS(inode, wbc, nr_to_write)
);
DECLARE_EVENT_CLASS(writeback_lazytime_template,
DECLARE_EVENT_CLASS(writeback_inode_template,
TP_PROTO(struct inode *inode),
TP_ARGS(inode),
@ -723,25 +723,39 @@ DECLARE_EVENT_CLASS(writeback_lazytime_template,
show_inode_state(__entry->state), __entry->mode)
);
DEFINE_EVENT(writeback_lazytime_template, writeback_lazytime,
DEFINE_EVENT(writeback_inode_template, writeback_lazytime,
TP_PROTO(struct inode *inode),
TP_ARGS(inode)
);
DEFINE_EVENT(writeback_lazytime_template, writeback_lazytime_iput,
DEFINE_EVENT(writeback_inode_template, writeback_lazytime_iput,
TP_PROTO(struct inode *inode),
TP_ARGS(inode)
);
DEFINE_EVENT(writeback_lazytime_template, writeback_dirty_inode_enqueue,
DEFINE_EVENT(writeback_inode_template, writeback_dirty_inode_enqueue,
TP_PROTO(struct inode *inode),
TP_ARGS(inode)
);
/*
* Inode writeback list tracking.
*/
DEFINE_EVENT(writeback_inode_template, sb_mark_inode_writeback,
TP_PROTO(struct inode *inode),
TP_ARGS(inode)
);
DEFINE_EVENT(writeback_inode_template, sb_clear_inode_writeback,
TP_PROTO(struct inode *inode),
TP_ARGS(inode)
);
#endif /* _TRACE_WRITEBACK_H */
/* This part must be outside protection */