Messages in this thread | | | Subject | Re: [PATCH 4/4] blk-throttle: cleanup throtl_dequeue_tg() | From | Yu Kuai <> | Date | Wed, 24 Aug 2022 09:19:51 +0800 |
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Hi, Tejun
在 2022/08/24 2:34, Tejun Heo 写道: > On Tue, Aug 23, 2022 at 09:38:10AM +0800, Yu Kuai wrote: >> From: Yu Kuai <yukuai3@huawei.com> >> >> Now that throtl_dequeue_tg() is called when the last bio is dispatched, >> there is no need to check the flag THROTL_TG_PENDING, since it's ensured >> to be set when bio is throttled. >> >> There are no functional changes. >> >> Signed-off-by: Yu Kuai <yukuai3@huawei.com> >> --- >> block/blk-throttle.c | 11 ++++------- >> 1 file changed, 4 insertions(+), 7 deletions(-) >> >> diff --git a/block/blk-throttle.c b/block/blk-throttle.c >> index 47142a1dd102..e47506a8ef47 100644 >> --- a/block/blk-throttle.c >> +++ b/block/blk-throttle.c >> @@ -570,14 +570,11 @@ static void throtl_enqueue_tg(struct throtl_grp *tg) >> >> static void throtl_dequeue_tg(struct throtl_grp *tg) >> { >> - if (tg->flags & THROTL_TG_PENDING) { >> - struct throtl_service_queue *parent_sq = >> - tg->service_queue.parent_sq; >> + struct throtl_service_queue *parent_sq = tg->service_queue.parent_sq; >> >> - throtl_rb_erase(&tg->rb_node, parent_sq); >> - --parent_sq->nr_pending; >> - tg->flags &= ~THROTL_TG_PENDING; >> - } >> + throtl_rb_erase(&tg->rb_node, parent_sq); >> + --parent_sq->nr_pending; >> + tg->flags &= ~THROTL_TG_PENDING; > > Yeah, I don't know about this one. This breaks the symmetry with > throtl_enqueue_tg() and it's a bit odd that we aren't at least > WARN_ON_ONCE() on the flag given what the flag tracks. If you want to do > this, I think the prev approach of just removing the flag is better as that > was symmetric at least.
Yes, you are right, thanks for the advice. Since now it's a bit ambivalent, we might as well just remove this patch?
Thanks, Kuai > > Thanks. >
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