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| author | Olaf Kirch <okir@suse.de> | 2006-12-01 10:39:12 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2006-12-01 10:39:12 +0100 |
| commit | be1c63411addba3ad750eb4fdfc50b97bc82825e (patch) | |
| tree | d00c889873310a5c6ee0caf79f2b70e64a382796 /include/linux/blktrace_api.h | |
| parent | 0215ffb08ce99e2bb59eca114a99499a4d06e704 (diff) | |
| download | lwn-be1c63411addba3ad750eb4fdfc50b97bc82825e.tar.gz lwn-be1c63411addba3ad750eb4fdfc50b97bc82825e.zip | |
[PATCH] blktrace: add timestamp message
This adds a new timestamp message to blktrace, giving the timeofday when
we starting tracing. This helps user space correlate block trace events
with eg an application strace.
This requires a (compatible) update to blkparse. The changed blkparse
is still able to process traces generated by older kernels, and older
versions of blkparse should silently ignore the new records (because
they have a pid of 0).
Signed-off-by: Olaf Kirch <okir@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/linux/blktrace_api.h')
| -rw-r--r-- | include/linux/blktrace_api.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h index b99a714fcac6..3680ff9a30ed 100644 --- a/include/linux/blktrace_api.h +++ b/include/linux/blktrace_api.h @@ -50,6 +50,15 @@ enum blktrace_act { }; /* + * Notify events. + */ +enum blktrace_notify { + __BLK_TN_PROCESS = 0, /* establish pid/name mapping */ + __BLK_TN_TIMESTAMP, /* include system clock */ +}; + + +/* * Trace actions in full. Additionally, read or write is masked */ #define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE)) @@ -68,6 +77,9 @@ enum blktrace_act { #define BLK_TA_BOUNCE (__BLK_TA_BOUNCE) #define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE)) +#define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY)) +#define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY)) + #define BLK_IO_TRACE_MAGIC 0x65617400 #define BLK_IO_TRACE_VERSION 0x07 |