From: Andi Kleen <ak@linux.intel.com>
To: Jann Horn <jannh@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
tursulin@ursulin.net, kernel list <linux-kernel@vger.kernel.org>,
tvrtko.ursulin@linux.intel.com,
Peter Zijlstra <peterz@infradead.org>,
the arch/x86 maintainers <x86@kernel.org>,
"H . Peter Anvin" <hpa@zytor.com>,
acme@kernel.org, alexander.shishkin@linux.intel.com,
jolsa@redhat.com, namhyung@kernel.org, maddy@linux.vnet.ibm.com,
alexey.budankov@linux.intel.com,
Kees Cook <keescook@chromium.org>
Subject: Re: [RFC 0/5] perf: Per PMU access controls (paranoid setting)
Date: Fri, 28 Sep 2018 13:59:07 -0700 [thread overview]
Message-ID: <20180928205907.GD32651@tassilo.jf.intel.com> (raw)
In-Reply-To: <CAG48ez16ECnLMNggTZQQJOuPK5ZJ8dLSkGDzvxwK1zVh1BFExw@mail.gmail.com>
> > This new file descriptor argument doesn't exist today so it would
> > need to create a new system call with more arguments
>
> Is that true? The first argument is a pointer to a struct that
> contains its own size, so it can be expanded without an ABI break. I
> don't see any reason why you couldn't cram more stuff in there.
You're right we could put the fd into the perf_event, but the following is
still true:
> > Obviously we would need to keep the old system call around
> > for compability, so you would need to worry about this
> > interaction in any case!
> >
> > So tying it together doesn't make any sense, because
> > the problem has to be solved separately anyways.
-Andi
next prev parent reply other threads:[~2018-09-28 20:59 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-19 12:27 [RFC 0/5] perf: Per PMU access controls (paranoid setting) Tvrtko Ursulin
2018-09-19 12:27 ` [RFC 1/5] perf: Move some access checks later in perf_event_open Tvrtko Ursulin
2018-09-19 12:27 ` [RFC 2/5] perf: Pass pmu pointer to perf_paranoid_* helpers Tvrtko Ursulin
2018-09-19 12:27 ` [RFC 3/5] perf: Allow per PMU access control Tvrtko Ursulin
2018-09-27 20:15 ` Andi Kleen
2018-09-28 8:57 ` Tvrtko Ursulin
2018-09-19 12:27 ` [RFC 4/5] perf Documentation: Document the per PMU perf_event_paranoid interface Tvrtko Ursulin
2018-09-19 12:27 ` [RFC 5/5] tools/perf: Add support for per-PMU access control Tvrtko Ursulin
2018-09-28 10:26 ` [RFC 0/5] perf: Per PMU access controls (paranoid setting) Thomas Gleixner
2018-09-28 13:22 ` Tvrtko Ursulin
2018-09-28 14:02 ` Thomas Gleixner
2018-09-28 14:56 ` Tvrtko Ursulin
2018-09-28 15:23 ` Thomas Gleixner
2018-09-28 15:45 ` Alexey Budankov
2018-09-28 18:20 ` Thomas Gleixner
2018-09-28 20:45 ` Andi Kleen
2018-09-29 6:19 ` Thomas Gleixner
2018-10-01 6:25 ` Alexey Budankov
2018-09-28 15:12 ` Jann Horn
2018-09-28 22:02 ` Jann Horn
2018-10-01 6:27 ` Alexey Budankov
2018-09-28 16:41 ` Mark Rutland
2018-09-28 17:23 ` Andi Kleen
2018-09-28 17:40 ` Mark Rutland
2018-09-28 20:49 ` Andi Kleen
2018-09-28 20:54 ` Jann Horn
2018-09-28 20:59 ` Andi Kleen [this message]
2018-09-28 21:22 ` Jann Horn
2018-09-28 21:27 ` Andi Kleen
2018-10-01 6:25 ` Alexey Budankov
2018-10-01 16:11 ` Thomas Gleixner
2018-10-01 16:15 ` Jann Horn
2018-10-01 20:51 ` Alexey Budankov
2018-10-02 6:40 ` Thomas Gleixner
2018-10-02 11:44 ` Alexey Budankov
2018-10-03 17:01 ` Jann Horn
2018-10-04 17:11 ` Alexey Budankov
2018-09-29 6:30 ` Thomas Gleixner
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