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

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Message-ID: <YwR0DL319gD/ebha@worktop.programming.kicks-ass.net>
Date:   Tue, 23 Aug 2022 08:30:36 +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, alexey.budankov@...ux.intel.com,
        ak@...ux.intel.com, mark.rutland@....com, megha.dey@...el.com,
        frederic@...nel.org, maddy@...ux.ibm.com, irogers@...gle.com,
        kim.phillips@....com, linux-kernel@...r.kernel.org,
        santosh.shukla@....com
Subject: Re: [RFC v2] perf: Rewrite core context handling

On Mon, Aug 22, 2022 at 10:07:45PM +0530, Ravi Bangoria wrote:
> On 22-Aug-22 9:13 PM, Peter Zijlstra wrote:
> > On Mon, Aug 22, 2022 at 05:29:11PM +0200, Peter Zijlstra wrote:
> >> On Tue, Aug 02, 2022 at 11:41:42AM +0530, Ravi Bangoria wrote:
> >>>
> >>>> pulling up the ctx->mutex makes things simpler, but also violates the
> >>>> locking order vs exec_update_lock.
> >>>>
> >>>> Pull that lock up as well...
> >>>
> >>> I'm not able to apply this patch as is but I get the idea. Few
> >>> questions below...
> >>
> >> I was just about to rebase the 'series' to current, let me do that and
> >> get back to you on the specifics.
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/log/?h=perf/wip.rewrite
> 
> Additional set of changes on top of this tree is required to build and boot,
> atleast on my AMD machine:

Right; clearly I didn't even test build that thing... your changes look
fine and added then on top, above tree should be updated.