linux-kernel - Re: [RFC v5 09/11] mm: Try spin lock in speculative path

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Date:   Thu, 6 Jul 2017 18:13:02 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Laurent Dufour <ldufour@...ux.vnet.ibm.com>
Cc:     paulmck@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
        kirill@...temov.name, ak@...ux.intel.com, mhocko@...nel.org,
        dave@...olabs.net, jack@...e.cz,
        Matthew Wilcox <willy@...radead.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        haren@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com,
        npiggin@...il.com, bsingharora@...il.com,
        Tim Chen <tim.c.chen@...ux.intel.com>
Subject: Re: [RFC v5 09/11] mm: Try spin lock in speculative path

On Thu, Jul 06, 2017 at 05:29:26PM +0200, Laurent Dufour wrote:
> Based on the benchmarks I run, it doesn't fail so much often, but I was
> thinking about adding some counters here. The system is accounting for
> major page faults and minor ones, respectively current->maj_flt and
> current->min_flt. I was wondering if an additional type like async_flt will
> be welcome or if there is another smarter way to get that metric.
> 
> Feel free to advise.

You could stick a tracepoint in, or extend PERF_COUNT_SW_PAGE_FAULTS*.