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* [PATCH] block/bfq: the delta_from_first should be ns rather than us
@ 2021-07-21  6:30 liubaozhu
  2021-07-21  7:56 ` Paolo Valente
       [not found] ` <3A3B282C-FA5D-43F3-9C78-5E257C93A835@linaro.org>
  0 siblings, 2 replies; 3+ messages in thread
From: liubaozhu @ 2021-07-21  6:30 UTC (permalink / raw)
  To: paolo.valente; +Cc: axboe, linux-block, linux-kernel, liubaozhu

In the block/bfq-iosched.c,the function bfq_update_peak_rate(),
bfqd->delta_from_first = now_ns - bfqd->first_dispatch,
according to the subtraction operation here,now_ns is ns,
and bfqd->first_dispatch is also ns,so bfqd->delta_from_first should be ns.

Signed-off-by: liubaozhu <liubaozhu@uniontech.com>
---
 block/bfq-iosched.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
index 99c2a3cb0..7cf4fc8c3 100644
--- a/block/bfq-iosched.h
+++ b/block/bfq-iosched.h
@@ -632,7 +632,7 @@ struct bfq_data {
 	u64 tot_sectors_dispatched;
 	/* max rq size seen during current observation interval (sectors) */
 	u32 last_rq_max_size;
-	/* time elapsed from first dispatch in current observ. interval (us) */
+	/* time elapsed from first dispatch in current observ. interval (ns) */
 	u64 delta_from_first;
 	/*
 	 * Current estimate of the device peak rate, measured in
-- 
2.20.1




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2021-07-21  6:30 [PATCH] block/bfq: the delta_from_first should be ns rather than us liubaozhu
2021-07-21  7:56 ` Paolo Valente
     [not found] ` <3A3B282C-FA5D-43F3-9C78-5E257C93A835@linaro.org>
2021-07-21 16:19   ` Jens Axboe

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