linux-kernel - Re: [RFC PATCH] mm: silence soft lockups from unlock

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Message-Id: <664A07B6-DBCD-4520-84F1-241A4E7A339F@lca.pw>
Date:   Tue, 21 Jul 2020 07:44:07 -0400
From:   Qian Cai <cai@....pw>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>
Subject: Re: [RFC PATCH] mm: silence soft lockups from unlock_page



> On Jul 21, 2020, at 7:25 AM, Michal Hocko <mhocko@...nel.org> wrote:
> 
> Are these really important? I believe I can dig that out from the bug
> report but I didn't really consider that important enough.

Please dig them out. We have also been running those things on “large” powerpc as well and never saw such soft-lockups. Those details may give us some clues about the actual problem. Once we understand the problem better, we may judge if this “hack” is really worth it.