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authorLi Zefan <lizf@cn.fujitsu.com>2009-04-14 02:00:05 -0400
committerIngo Molnar <mingo@elte.hu>2009-04-16 04:10:59 -0400
commit1d54ad6da9192fed5dd3b60224d9f2dfea0dcd82 (patch)
treefd5917f144ec820b933795bedd7eddea96bee374 /kernel/trace/blktrace.c
parent9908c30997b8a73c95f836170b9998dae9aa3f4a (diff)
blktrace: add trace/ to /sys/block/sda
Impact: allow ftrace-plugin blktrace to trace device-mapper devices To trace a single partition: # echo 1 > /sys/block/sda/sda1/enable To trace the whole sda instead: # echo 1 > /sys/block/sda/enable Thus we also fix an issue reported by Ted, that ftrace-plugin blktrace can't be used to trace device-mapper devices. Now: # echo 1 > /sys/block/dm-0/trace/enable echo: write error: No such device or address # mount -t ext4 /dev/dm-0 /mnt # echo 1 > /sys/block/dm-0/trace/enable # echo blk > /debug/tracing/current_tracer Reported-by: Theodore Tso <tytso@mit.edu> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Shawn Du <duyuyang@gmail.com> Cc: Jens Axboe <jens.axboe@oracle.com> LKML-Reference: <49E42665.6020506@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/blktrace.c')
-rw-r--r--kernel/trace/blktrace.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index d10989880520..8e7c5da3a3e6 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1644,3 +1644,8 @@ out:
1644 return ret ? ret : count; 1644 return ret ? ret : count;
1645} 1645}
1646 1646
1647int blk_trace_init_sysfs(struct device *dev)
1648{
1649 return sysfs_create_group(&dev->kobj, &blk_trace_attr_group);
1650}
1651