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From: Peter Zijlstra <peterz@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Dave Jones <davej@codemonkey.org.uk>,
	Linux Kernel <linux-kernel@vger.kernel.org>,
	Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: 5.14-rc breaks iotop swap io monitoring.
Date: Tue, 24 Aug 2021 19:35:27 +0200	[thread overview]
Message-ID: <20210824173527.GA17784@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <CAHk-=wiRe=JBK85HG7xtXH1XbOWcO1KYW8csuWfLuFoHKTqF0w@mail.gmail.com>

On Tue, Aug 24, 2021 at 09:34:02AM -0700, Linus Torvalds wrote:

> Even if you enable it at run-time, processes that have been started
> before it was enabled won't actually have the 'tsk->delays'
> allocation. So I'm not sure how effective the run-time thing is.

Right; we *could* fix that by looping through the tasklist; grabbing a
task ref, doing the alloc and restarting until we've iterated the whole
tasklist and not found a task without a delays thing.

Didn't think it would be worth it, but can be done..

  reply	other threads:[~2021-08-24 17:58 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24  3:16 Dave Jones
2021-08-24  3:18 ` Dave Jones
2021-08-24  8:31 ` Peter Zijlstra
2021-08-24 15:19   ` Dave Jones
2021-08-24 16:34     ` Linus Torvalds
2021-08-24 17:35       ` Peter Zijlstra [this message]
2021-08-24 21:33       ` Dave Jones
2021-08-24 23:26         ` Linus Torvalds
2021-08-25  0:29           ` Dave Jones
2021-08-25  7:36           ` Peter Zijlstra

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