linux-kernel - Re: [PATCH v2] mm/hugetlb: Defer freeing of huge pages if in non-task context

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20191217145956.GB7272@dhcp22.suse.cz>
Date:   Tue, 17 Dec 2019 15:59:56 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Mike Kravetz <mike.kravetz@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Matthew Wilcox <willy@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Andi Kleen <ak@...ux.intel.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Subject: Re: [PATCH v2] mm/hugetlb: Defer freeing of huge pages if in
 non-task context

On Tue 17-12-19 09:06:31, Waiman Long wrote:
> On 12/17/19 4:31 AM, Michal Hocko wrote:
> > On Mon 16-12-19 20:25:08, Waiman Long wrote:
[...]
> >> +	pr_debug("HugeTLB: free_hpage_workfn() frees %d huge page(s)\n", cnt);
> > Why do we need the debugging message here?
> 
> It is there just to verify that the workfn is properly activated and
> frees the huge page. This message won't be printed by default. I can
> remove it if you guys don't really want a debug statement here.

Yes, drop it please. We are not adding debugging messages unless they
are really actionable. If this is a sign of a bug then put a WARN_ONCE or
somethin like that. But with a simple code like this it doesn't really
seem to be suitable IMHO.

Thanks!
-- 
Michal Hocko
SUSE Labs