From: Peter Zijlstra <peterz@infradead.org>
To: Mark Rutland <mark.rutland@arm.com>
Cc: linux-kernel@vger.kernel.org, will.deacon@arm.com,
dave.martin@arm.com, Ingo Molnar <mingo@redhat.com>
Subject: Re: [PATCH 4/7] perf: be less pessimistic when scheduling events
Date: Mon, 10 Feb 2014 18:58:54 +0100 [thread overview]
Message-ID: <20140210175854.GB27965@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1392054264-23570-5-git-send-email-mark.rutland@arm.com>
On Mon, Feb 10, 2014 at 05:44:21PM +0000, Mark Rutland wrote:
> This patch makes ctx_flexible_sched_in attempt to schedule every group
> in the flexible_groups list even when earlier groups failed to schedule,
> enabling more groups to be scheduled simultaneously.
Since you're basically free to create as many events as you want, you can
(as an unprivilidged user) make the context switch to and from your task
arbitrarily expensive.
So no, that's not going to fly.
next prev parent reply other threads:[~2014-02-10 17:59 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-10 17:44 [PATCH 0/7] Perf core cleanups for shared perf_event_contexts Mark Rutland
2014-02-10 17:44 ` [PATCH 1/7] perf: fix prototype of find_pmu_context Mark Rutland
2014-02-27 13:33 ` [tip:perf/core] perf: Fix prototype of find_pmu_context() tip-bot for Mark Rutland
2014-02-10 17:44 ` [PATCH 2/7] perf: remove redundant pmu assignment Mark Rutland
2014-02-27 13:33 ` [tip:perf/core] perf: Remove redundant PMU assignment tip-bot for Mark Rutland
2014-02-10 17:44 ` [PATCH 3/7] perf: kill perf_event_context_type Mark Rutland
2014-02-25 11:38 ` Peter Zijlstra
2014-02-27 11:46 ` Mark Rutland
2014-02-10 17:44 ` [PATCH 4/7] perf: be less pessimistic when scheduling events Mark Rutland
2014-02-10 17:58 ` Peter Zijlstra [this message]
2014-02-11 17:48 ` Mark Rutland
2014-02-25 11:29 ` Peter Zijlstra
2014-02-27 12:07 ` Mark Rutland
2014-02-10 17:44 ` [PATCH 5/7] perf: kill pmu::hrtimer_interval_ms Mark Rutland
2014-02-10 17:44 ` [PATCH 6/7] perf: Centralise context pmu disabling Mark Rutland
2014-02-10 18:08 ` Peter Zijlstra
2014-02-10 17:44 ` [PATCH 7/7] perf: kill perf_event_context::pmu Mark Rutland
2014-02-10 18:10 ` Peter Zijlstra
2014-02-11 17:56 ` Mark Rutland
2014-02-12 15:01 ` Dave Martin
2014-02-25 11:31 ` Peter Zijlstra
2014-02-27 11:48 ` Mark Rutland
2014-02-27 11:51 ` Peter Zijlstra
2014-02-27 12:30 ` Mark Rutland
2014-02-19 13:43 ` [PATCH 0/7] Perf core cleanups for shared perf_event_contexts Mark Rutland
2014-02-25 11:39 ` Peter Zijlstra
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