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| author | Douglas Anderson <dianders@chromium.org> | 2019-06-26 12:59:19 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-06-26 16:25:35 -0600 |
| commit | 2b50f230f76f8ef954f12ac34a648e1978f6adf0 (patch) | |
| tree | e7be66be7387ba0f2278b5a2ea68d581ef8ad146 /block | |
| parent | 2ad7a0cc8f8ec37b2f65f6990faae7dec0058d55 (diff) | |
| download | lwn-2b50f230f76f8ef954f12ac34a648e1978f6adf0.tar.gz lwn-2b50f230f76f8ef954f12ac34a648e1978f6adf0.zip | |
block, bfq: Init saved_wr_start_at_switch_to_srt in unlikely case
Some debug code suggested by Paolo was tripping when I did reboot
stress tests. Specifically in bfq_bfqq_resume_state()
"bic->saved_wr_start_at_switch_to_srt" was later than the current
value of "jiffies". A bit of debugging showed that
"bic->saved_wr_start_at_switch_to_srt" was actually 0 and a bit more
debugging showed that was because we had run through the "unlikely"
case in the bfq_bfqq_save_state() function.
Let's init "saved_wr_start_at_switch_to_srt" in the unlikely case to
something sane.
NOTE: this fixes no known real-world errors.
Reviewed-by: Paolo Valente <paolo.valente@linaro.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/bfq-iosched.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index 72840ebf953e..008c93d6b8d7 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -2678,6 +2678,7 @@ static void bfq_bfqq_save_state(struct bfq_queue *bfqq) * to enjoy weight raising if split soon. */ bic->saved_wr_coeff = bfqq->bfqd->bfq_wr_coeff; + bic->saved_wr_start_at_switch_to_srt = bfq_smallest_from_now(); bic->saved_wr_cur_max_time = bfq_wr_duration(bfqq->bfqd); bic->saved_last_wr_start_finish = jiffies; } else { |