________________________________
发件人: Matthew Wilcox <willy@infradead.org>
发送时间: 星期日, 七月 11, 2021 05:10
收件人: Andrew Morton
抄送: Zhang, Qiang; mgorman@techsingularity.net; linux-mm@kvack.org; linux-kernel@vger.kernel.org
主题: Re: [PATCH] mm/page_alloc: avoid hard lockups in __alloc_pages_bulk()

[Please note: This e-mail is from an EXTERNAL e-mail address]

On Sat, Jul 10, 2021 at 11:46:13AM -0700, Andrew Morton wrote:
> On Sat, 10 Jul 2021 19:29:29 +0800 qiang.zhang@windriver.com wrote:
>
> > From: Zqiang <qiang.zhang@windriver.com>
> >
> > The __alloc_pages_bulk() mainly used for batch allocation of
> > order-0 pages, in the case of holding pagesets.lock, if too
> > many pages are required, maybe trigger hard lockup watchdog.
>
> Ouch.  Has this been observed in testing?  If so, can you please share
> the kernel debug output from that event?

>This should be fixed in the caller by asking for fewer pages.
>The NFS and vmalloc cases have already been fixed for this.

The NFS and vmalloc cases haven  been fixed？
I don’t see if there is any information about that?

Thanks
Qiang