linux-kernel - Re: [PATCH 0/2] perf: Allow closing siblings' file descriptors

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Message-ID: <20200806083717.GW2674@hirez.programming.kicks-ass.net>
Date:   Thu, 6 Aug 2020 10:37:17 +0200
From:   peterz@...radead.org
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        g@...ez.programming.kicks-ass.net
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Jiri Olsa <jolsa@...nel.org>, alexey.budankov@...ux.intel.com
Subject: Re: [PATCH 0/2] perf: Allow closing siblings' file descriptors

On Thu, Aug 06, 2020 at 09:15:08AM +0300, Adrian Hunter wrote:
> On 8/07/20 6:16 pm, Alexander Shishkin wrote:
> > Hi guys,
> > 
> > I've been looking at reducing the number of open file descriptors per perf
> > session. If we retain one descriptor per event, in a large group they add
> > up. At the same time, we're not actually using them for anything after the
> > SET_OUTPUT and maybe SET_FILTER ioctls. So, this series is a stab at that.
> 
> I am wondering if instead we should be looking at creating a kernel API that
> allows associating a multitude of tracepoints with a single event.  Thoughts
> anyone?

https://lkml.kernel.org/r/1290445737.2072.338.camel@laptop