From 63c9eac4b6d75859703f5820414986edefb01210 Mon Sep 17 00:00:00 2001 From: Kemeng Shi Date: Tue, 18 Oct 2022 20:19:30 +0800 Subject: blk-iocost: Trace vtime_base_rate instead of vtime_rate Since commit ac33e91e2daca ("blk-iocost: implement vtime loss compensation") rename original vtime_rate to vtime_base_rate and current vtime_rate is original vtime_rate with compensation. The current rate showed in tracepoint is mixed with vtime_rate and vtime_base_rate: 1) In function ioc_adjust_base_vrate, the first trace_iocost_ioc_vrate_adj shows vtime_rate, the second trace_iocost_ioc_vrate_adj shows vtime_base_rate. 2) In function iocg_activate shows vtime_rate by calling TRACE_IOCG_PATH(iocg_activate... 3) In function ioc_check_iocgs shows vtime_rate by calling TRACE_IOCG_PATH(iocg_idle... Trace vtime_base_rate instead of vtime_rate as: 1) Before commit ac33e91e2daca ("blk-iocost: implement vtime loss compensation"), the traced rate is without compensation, so still show rate without compensation. 2) The vtime_base_rate is more stable while vtime_rate heavily depends on excess budeget on current period which may change abruptly in next period. Signed-off-by: Kemeng Shi Acked-by: Tejun Heo Link: https://lore.kernel.org/r/20221018121932.10792-4-shikemeng@huawei.com Signed-off-by: Jens Axboe --- block/blk-iocost.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'block') diff --git a/block/blk-iocost.c b/block/blk-iocost.c index c3945d470779..f57a84ff0244 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -977,7 +977,7 @@ static void ioc_adjust_base_vrate(struct ioc *ioc, u32 rq_wait_pct, if (!ioc->busy_level || (ioc->busy_level < 0 && nr_lagging)) { if (ioc->busy_level != prev_busy_level || nr_lagging) - trace_iocost_ioc_vrate_adj(ioc, atomic64_read(&ioc->vtime_rate), + trace_iocost_ioc_vrate_adj(ioc, vrate, missed_ppm, rq_wait_pct, nr_lagging, nr_shortages); -- cgit v1.2.3