linux-kernel - Re: [PATCH] block: strip out locking optimization in put_io

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Message-ID: <CANejiEXaaSfv8Rs3Rg6zLamYsUj=apKku6yrw7EUtpKkB1ZATA@mail.gmail.com>
Date:	Fri, 10 Feb 2012 13:14:09 +0800
From:	Shaohua Li <shli@...nel.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Jens Axboe <axboe@...nel.dk>, Vivek Goyal <vgoyal@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Knut Petersen <Knut_Petersen@...nline.de>, mroos@...ux.ee,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] block: strip out locking optimization in put_io_context()

2012/2/10 Tejun Heo <tj@...nel.org>:
> Hello, Shaohua.
>
> Can you please test the following one?  It's probably the simplest
> version w/o RCU and wq deferring.  RCUfying isn't too bad but I'm
> still a bit hesitant because RCU coverage needs to be extended to
> request_queue via conditional synchronize_rcu() in queue exit path
> (can't enforce delayed RCU free on request_queues and unconditional
> synchronize_rcu() may cause excessive delay during boot for certain
> configurations).  It now can be done in the block core layer proper so
> it shouldn't be as bad tho.  If this too flops, I'll get to that.
doesn't work.
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