linux-kernel - Re: [PATCH v2] perf: Rewrite core context handling

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Date:   Fri, 14 Oct 2022 16:50:12 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ravi Bangoria <ravi.bangoria@....com>
Cc:     acme@...nel.org, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org, songliubraving@...com,
        eranian@...gle.com, ak@...ux.intel.com, mark.rutland@....com,
        frederic@...nel.org, maddy@...ux.ibm.com, irogers@...gle.com,
        will@...nel.org, robh@...nel.org, mingo@...hat.com,
        catalin.marinas@....com, ndesaulniers@...gle.com,
        srw@...dewatkins.net, linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        sandipan.das@....com, ananth.narayan@....com, kim.phillips@....com,
        santosh.shukla@....com
Subject: Re: [PATCH v2] perf: Rewrite core context handling

On Fri, Oct 14, 2022 at 03:26:07PM +0530, Ravi Bangoria wrote:
> On 13-Oct-22 4:29 PM, Peter Zijlstra wrote:
> > On Thu, Oct 13, 2022 at 03:37:23PM +0530, Ravi Bangoria wrote:
> > 
> >>> -	refcount_t			refcount;
> >>> +	refcount_t			refcount; /* event <-> ctx */
> >>
> >> Ok. We need to remove all those // XXX get/put_ctx() from code
> >> which we added to make refcount a pmu_ctx <-> ctx.
> > 
> > Them already gone :-) I've not yet fixed up the typoes, but current
> > version should be here:
> > 
> >   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/log/?h=perf/core
> > 
> > Thanks!
> 
> I've been running perf-fuzzer on Xeon machine since yesterday and I don't see any
> issue. Will do the same on my AMD machine as well over the weekend.

Awesome -- I've started fuzzing on the ADL (with the big.LITTLE PMU
setup) and I've had it run on my very aged IVB-EP machine. Both so far
(knock on wood) with no issues.

The most modern AMD machine I have at hand is a 2 socket Interlagos, and
I doubt anybody really much cares about that these days -- but I can run
it for giggles.