linux-kernel - Re: [PATCH] mm/page_alloc: avoid hard lockups in __alloc_pages

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Message-Id: <20210710114613.0db3ac139a7b3102a6ca3ad4@linux-foundation.org>
Date:   Sat, 10 Jul 2021 11:46:13 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     qiang.zhang@...driver.com
Cc:     mgorman@...hsingularity.net, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/page_alloc: avoid hard lockups in
 __alloc_pages_bulk()

On Sat, 10 Jul 2021 19:29:29 +0800 qiang.zhang@...driver.com wrote:

> From: Zqiang <qiang.zhang@...driver.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?