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authorOlaf Kirch <okir@suse.de>2006-12-01 10:39:12 +0100
committerJens Axboe <jens.axboe@oracle.com>2006-12-01 10:39:12 +0100
commitbe1c63411addba3ad750eb4fdfc50b97bc82825e (patch)
treed00c889873310a5c6ee0caf79f2b70e64a382796 /include/linux/blktrace_api.h
parent0215ffb08ce99e2bb59eca114a99499a4d06e704 (diff)
downloadop-kernel-dev-be1c63411addba3ad750eb4fdfc50b97bc82825e.zip
op-kernel-dev-be1c63411addba3ad750eb4fdfc50b97bc82825e.tar.gz
[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.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index b99a714..3680ff9a 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
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