From: Michal Hocko <mhocko@kernel.org>
To: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: David Hildenbrand <david@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
Dan Williams <dan.j.williams@intel.com>,
Shile Zhang <shile.zhang@linux.alibaba.com>,
Daniel Jordan <daniel.m.jordan@oracle.com>,
Kirill Tkhai <ktkhai@virtuozzo.com>,
James Morris <jmorris@namei.org>, Sasha Levin <sashal@kernel.org>,
Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [PATCH v2 2/2] mm: initialize deferred pages with interrupts enabled
Date: Thu, 2 Apr 2020 19:16:31 +0200 [thread overview]
Message-ID: <20200402171631.GU22681@dhcp22.suse.cz> (raw)
In-Reply-To: <CA+CK2bAFsTJT2zU=+OyHj_-=zTKbw6mLHzrc2VEoGjPQpfhppQ@mail.gmail.com>
On Thu 02-04-20 11:13:49, Pavel Tatashin wrote:
> > > I do wonder if this change is strictly required in this patch (IOW, if
> > > we could keep calling touch_nmi_watchdog() also without holding a spinlock)
> >
> > Exactly. I would go with your patch on top.
> >
> > > Anyhow, it's the right thing to do.
>
> Michal,
>
> The reason I changed it here is because in the original patch that
> this patch fixes we changed cond_sched() to touch_nmi_watchdog():
> $ git show 3a2d7fa8a3d5 | grep -E '(nmi|sched)'
> - cond_resched();
> + touch_nmi_watchdog();
> - cond_resched();
> + touch_nmi_watchdog();
>
> So, should I move it to a separate patch or is it OK to keep it here?
Having in a separate patch would be better IMO. If for nothing else, the
RCU stall would be easier to see.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2020-04-02 17:16 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-01 22:57 [PATCH v2 0/2] " Pavel Tatashin
2020-04-01 22:57 ` [PATCH v2 1/2] mm: call touch_nmi_watchdog() on max order boundaries in deferred init Pavel Tatashin
2020-04-02 7:23 ` David Hildenbrand
2020-04-02 7:46 ` Michal Hocko
2020-04-02 11:36 ` Vlastimil Babka
2020-04-01 22:57 ` [PATCH v2 2/2] mm: initialize deferred pages with interrupts enabled Pavel Tatashin
2020-04-02 7:14 ` David Hildenbrand
2020-04-02 15:49 ` Pavel Tatashin
2020-04-02 7:38 ` David Hildenbrand
2020-04-02 7:47 ` Michal Hocko
2020-04-02 15:13 ` Pavel Tatashin
2020-04-02 17:16 ` Michal Hocko [this message]
2020-04-02 18:25 ` Pavel Tatashin
2020-04-02 12:09 ` Vlastimil Babka
2020-04-02 15:05 ` Pavel Tatashin
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