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authorNikanth Karthikesan <knikanth@suse.de>2009-09-11 09:18:54 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-09-14 08:24:52 +0200
commita9327cac440be4d8333bba975cbbf76045096275 (patch)
tree83fd5dc45dc925c5b4eb0264c3add96cfaa4cae6 /block/blk-core.c
parent18d8217bc441630c3c5ec7416c5a65c69e8a0979 (diff)
downloadlinux-a9327cac440be4d8333bba975cbbf76045096275.tar.bz2
Seperate read and write statistics of in_flight requests
Currently, there is a single in_flight counter measuring the number of requests in the request_queue. But some monitoring tools would like to know how many read requests and write requests are in progress. Split the current in_flight counter into two seperate counters for read and write. This information is exported as a sysfs attribute, as changing the currently available stat files would break the existing tools. Signed-off-by: Nikanth Karthikesan <knikanth@suse.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-core.c')
-rw-r--r--block/blk-core.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 982d634e67f9..182ebe3eb9e0 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -69,7 +69,7 @@ static void drive_stat_acct(struct request *rq, int new_io)
part_stat_inc(cpu, part, merges[rw]);
else {
part_round_stats(cpu, part);
- part_inc_in_flight(part);
+ part_inc_in_flight(part, rw);
}
part_stat_unlock();
@@ -1030,7 +1030,7 @@ static void part_round_stats_single(int cpu, struct hd_struct *part,
if (part->in_flight) {
__part_stat_add(cpu, part, time_in_queue,
- part->in_flight * (now - part->stamp));
+ part_in_flight(part) * (now - part->stamp));
__part_stat_add(cpu, part, io_ticks, (now - part->stamp));
}
part->stamp = now;
@@ -1737,7 +1737,7 @@ static void blk_account_io_done(struct request *req)
part_stat_inc(cpu, part, ios[rw]);
part_stat_add(cpu, part, ticks[rw], duration);
part_round_stats(cpu, part);
- part_dec_in_flight(part);
+ part_dec_in_flight(part, rw);
part_stat_unlock();
}