From: Oleg Nesterov <oleg@redhat.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Milind Chabbi <chabbi.milind@gmail.com>,
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>,
Frederic Weisbecker <frederic@kernel.org>
Subject: Re: [PATCH 2/2] perf/hw_breakpoint: Modify breakpoint even if the new attr has disabled set
Date: Mon, 6 Aug 2018 15:46:58 +0200 [thread overview]
Message-ID: <20180806134658.GE7840@redhat.com> (raw)
In-Reply-To: <20180806132353.GA7463@krava>
On 08/06, Jiri Olsa wrote:
>
> > Afaics you do not need to clear attr.disabled, modify_user_hw_breakpoint_check()
> > updates it if err = 0. So I think
> >
> > if (!bp->attr.disabled)
> > perf_event_enable(bp);
> >
> > will look a bit better.
> >
> >
> > But, with or without this fix, shouldn't we set .disabled = 1 if modify_() fails?
> > IIUC this doesn't matter, bp->attr.disabled is not really used anyway, but looks a
> > bit confusing.
> >
>
> yea, I was looking on that, but as u said it makes no difference
> and I wanted to keep the patch as simple as possible ;-)
OK. So both patches look good to me.
Acked-by: Oleg Nesterov <oleg@redhat.com>
next prev parent reply other threads:[~2018-08-06 13:47 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-06 10:12 [PATCH 0/2] perf/hw_breakpoint: Fix breakpoint modify Jiri Olsa
2018-08-06 10:12 ` [PATCH 1/2] perf tests: Add breakpoint modify test Jiri Olsa
2018-08-06 10:12 ` [PATCH 2/2] perf/hw_breakpoint: Modify breakpoint even if the new attr has disabled set Jiri Olsa
2018-08-06 12:48 ` Oleg Nesterov
2018-08-06 13:07 ` Oleg Nesterov
2018-08-06 13:37 ` Jiri Olsa
2018-08-06 13:49 ` Oleg Nesterov
2018-08-06 14:21 ` Jiri Olsa
2018-08-06 13:23 ` Jiri Olsa
2018-08-06 13:46 ` Oleg Nesterov [this message]
2018-08-06 15:08 ` [PATCH 3/2] perf/hw_breakpoint: Remove superfluous bp->attr.disabled = 0 " Jiri Olsa
2018-08-06 16:34 ` Oleg Nesterov
2018-08-07 8:16 ` Jiri Olsa
2018-08-07 9:10 ` Oleg Nesterov
2018-08-07 14:39 ` Jiri Olsa
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