Re: [RFC] scripts: Include postprocessing script for memory allocation tracing

From	Michal Hocko <mhocko@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [RFC] scripts: Include postprocessing script for memory allocation tracing
Date	2016-10-16 09:40 +0200
Message-ID	<ssOd3-2Ix-3@gated-at.bofh.it> (permalink)
References	(3 earlier) <sj3n3-3HM-3@gated-at.bofh.it> <skrGG-87E-13@gated-at.bofh.it> <sktIu-19y-27@gated-at.bofh.it> <sr6xr-7XD-19@gated-at.bofh.it> <ssGIx-69W-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Sat 15-10-16 19:31:22, Janani Ravichandran wrote:
> 
> > On Oct 11, 2016, at 10:43 AM, Janani Ravichandran <janani.rvchndrn@gmail.com> wrote:
> > 
> > Alright. I’ll add a starting tracepoint, change the script accordingly and 
> > send a v2. Thanks!
> > 
> I looked at it again and I think that the context information we need 
> can be obtained from the tracepoint trace_mm_page_alloc in 
> alloc_pages_nodemask().

trace_mm_page_alloc will tell you details about the allocation, like
gfp mask, order but it doesn't tell you how long the allocation took at
its current form. So either you have to note jiffies at the allocation
start and then add the end-start in the trace point or we really need
another trace point to note the start. The later has an advantage that
we do not add unnecessary load for jiffies when the tracepoint is
disabled.
-- 
Michal Hocko
SUSE Labs

Thread

Re: [RFC] scripts: Include postprocessing script for memory allocation tracing Janani Ravichandran <janani.rvchndrn@gmail.com> - 2016-10-16 01:40 +0200
  Re: [RFC] scripts: Include postprocessing script for memory  allocation tracing Michal Hocko <mhocko@kernel.org> - 2016-10-16 09:40 +0200
    Re: [RFC] scripts: Include postprocessing script for memory  allocation tracing Michal Hocko <mhocko@kernel.org> - 2016-10-18 15:20 +0200
      Re: [RFC] scripts: Include postprocessing script for memory allocation tracing Janani Ravichandran <janani.rvchndrn@gmail.com> - 2016-10-21 01:20 +0200
        Re: [RFC] scripts: Include postprocessing script for memory  allocation tracing Michal Hocko <mhocko@kernel.org> - 2016-10-21 09:10 +0200

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