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From: Frederic Weisbecker <frederic@kernel.org>
To: Jiri Olsa <jolsa@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	David Ahern <dsahern@gmail.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Milind Chabbi <chabbi.milind@gmail.com>,
	Oleg Nesterov <oleg@redhat.com>
Subject: Re: [PATCH 4/5] perf/hw_breakpoint: Enable breakpoint in modify_user_hw_breakpoint
Date: Fri, 17 Aug 2018 16:50:08 +0200	[thread overview]
Message-ID: <20180817145007.GD12426@lerouge> (raw)
In-Reply-To: <20180810104730.3293-5-jolsa@kernel.org>

On Fri, Aug 10, 2018 at 12:47:29PM +0200, Jiri Olsa wrote:
> Currently we enable the breakpoint back only if the breakpoint
> modification was successful. If it fails we can leave the
> breakpoint in disabled state with attr->disabled == 0.
> 
> We can safely enable the breakpoint back for both the fail
> and success paths by checking the bp->attr.disabled, which
> either holds the new 'requested' disabled state or the
> original breakpoint state.
> 
> Suggested-by: Oleg Nesterov <oleg@redhat.com>
> Link: http://lkml.kernel.org/n/tip-79p9ttocwy2ju2s6qh25dvre@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>

Acked-by: Frederic Weisbecker <frederic@kernel.org>

Thanks a lot!

  parent reply	other threads:[~2018-08-17 14:50 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-10 10:47 [PATCHv3 0/5] perf/hw_breakpoint: Fix breakpoint modify Jiri Olsa
2018-08-10 10:47 ` [PATCH 1/5] perf tests: Add breakpoint modify tests Jiri Olsa
2018-08-10 10:47 ` [PATCH 2/5] perf/hw_breakpoint: Modify breakpoint even if the new attr has disabled set Jiri Olsa
2018-08-17 14:27   ` Frederic Weisbecker
2018-08-10 10:47 ` [PATCH 3/5] perf/hw_breakpoint: Remove superfluous bp->attr.disabled = 0 Jiri Olsa
2018-08-17 14:47   ` Frederic Weisbecker
2018-08-10 10:47 ` [PATCH 4/5] perf/hw_breakpoint: Enable breakpoint in modify_user_hw_breakpoint Jiri Olsa
2018-08-14 10:32   ` Oleg Nesterov
2018-08-17 14:50   ` Frederic Weisbecker [this message]
2018-08-10 10:47 ` [PATCH 5/5] perf/hw_breakpoint: Simplify breakpoint enable in perf_event_modify_breakpoint Jiri Olsa
2018-08-14 10:32   ` Oleg Nesterov
2018-08-17 11:48 ` [PATCHv3 0/5] perf/hw_breakpoint: Fix breakpoint modify Jiri Olsa
2018-08-27  9:12 [PATCHv4 " Jiri Olsa
2018-08-27  9:12 ` [PATCH 4/5] perf/hw_breakpoint: Enable breakpoint in modify_user_hw_breakpoint Jiri Olsa

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