linux-kernel - Re: [PATCH V3] mm/mprotect: Add a cond_resched() inside change_pmd

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Message-Id: <20171214124035.e77706f0a314f2082a2d1b7c@linux-foundation.org>
Date:   Thu, 14 Dec 2017 12:40:35 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, mhocko@...e.com
Subject: Re: [PATCH V3] mm/mprotect: Add a cond_resched() inside
 change_pmd_range()

On Thu, 14 Dec 2017 19:35:51 +0530 Anshuman Khandual <khandual@...ux.vnet.ibm.com> wrote:

> While testing on a large CPU system, detected the following RCU
> stall many times over the span of the workload. This problem
> is solved by adding a cond_resched() in the change_pmd_range()
> function.
> 
> [  850.962530] INFO: rcu_sched detected stalls on CPUs/tasks:

That's a bit rude.  I think I'll add a cc:stable to this one.