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  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Thu, 9 Nov 2017 11:09:20 +0100
From:   Michal Hocko <>
To:     peter enderborg <>
Cc:     peter enderborg <>,
        Tetsuo Handa <>,,,, Cong Wang <>,
        Dave Hansen <>,
        Johannes Weiner <>,
        Mel Gorman <>, Petr Mladek <>,
        Sergey Senozhatsky <>,
        Vlastimil Babka <>,
        "yuwang.yuwang" <>
Subject: Re: [PATCH] mm: don't warn about allocations which stall for too long

On Thu 09-11-17 10:34:46, peter enderborg wrote:
> On 11/09/2017 09:52 AM, Michal Hocko wrote:
> > I am not sure. I would rather see a tracepoint to mark the allocator
> > entry. This would allow both 1) measuring the allocation latency (to
> > compare it to the trace_mm_page_alloc and 2) check for stalls with
> > arbitrary user defined timeout (just print all allocations which haven't
> > passed trace_mm_page_alloc for the given amount of time).
> Traces are not that expensive, but there are more than few in calls
> in this path. And Im trying to keep it as small that it can used for
> maintenance versions too.
> This is suggestion is a quick way of keeping the current solution for
> the ones that are interested the slow allocations. If we are going
> for a solution with a time-out parameter from the user what interface
> do you suggest to do this configuration. A filter parameter for the
> event?

I meant to do all that in postprocessing. So no specific API is needed,
just parse the output. Anyway, it seems that the printk will be put in
shape in a forseeable future so we might preserve the stall warning
after all. It is the show_mem part which is interesting during that

Michal Hocko

Powered by blists - more mailing lists