linux-kernel - Re: [PATCH v4 3/3] mm: call cond_resched() from deferred_init

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Message-ID: <4fb5a025-c5d9-abb5-b063-16a22c8443f6@redhat.com>
Date:   Fri, 3 Apr 2020 17:17:54 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Pavel Tatashin <pasha.tatashin@...een.com>,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        mhocko@...e.com, linux-mm@...ck.org, dan.j.williams@...el.com,
        shile.zhang@...ux.alibaba.com, daniel.m.jordan@...cle.com,
        ktkhai@...tuozzo.com, jmorris@...ei.org, sashal@...nel.org,
        vbabka@...e.cz
Subject: Re: [PATCH v4 3/3] mm: call cond_resched() from
 deferred_init_memmap()

On 03.04.20 16:09, Pavel Tatashin wrote:
> Now that deferred pages are initialized with interrupts enabled we can
> replace touch_nmi_watchdog() with cond_resched(), as it was before
> 3a2d7fa8a3d5.
> 
> For now, we cannot do the same in deferred_grow_zone() as it is still
> initializes pages with interrupts disabled.
> 
> This change fixes RCU problem described:
> linux-mm/20200401104156.11564-2-david@...hat.com

BTW,

https://lkml.kernel.org/r/20200401104156.11564-2-david@redhat.com

Would be better.


-- 
Thanks,

David / dhildenb