From: Milind Chabbi <chabbi.milind@gmail.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Milind Chabbi <chabbi.milind@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Namhyung Kim <namhyung@kernel.org>,
linux-kernel@vger.kernel.org,
Michael Kerrisk-manpages <mtk.manpages@gmail.com>,
linux-man@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>,
Andi Kleen <ak@linux.intel.com>, Kan Liang <kan.liang@intel.com>,
Hari Bathini <hbathini@linux.vnet.ibm.com>,
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>,
Jin Yao <yao.jin@linux.intel.com>
Subject: Re: [PATCH] perf/core: fast breakpoint modification via _IOC_MODIFY_BREAKPOINT
Date: Wed, 8 Nov 2017 07:51:10 -0800 [thread overview]
Message-ID: <CAMmz+Y=PJ2kFf9mqoQDJY32VjpCQBCCuWOiHNXR3mSEzotSS_w@mail.gmail.com> (raw)
In-Reply-To: <20171108151218.GA11018@krava>
On Wed, Nov 8, 2017 at 7:12 AM, Jiri Olsa <jolsa@redhat.com> wrote:
> > I am not able to fully understand your concern.
> > Can you point to a code file and line related to your observation?
> > The patch is modeled after the existing modify_user_hw_breakpoint() function
> > present in events/hw_breakpoint.c; don't you see this problem in that code?
>
> the reserve_bp_slot/release_bp_slot functions manage
> counts for current breakpoints based on its type
>
> those counts are cumulated in here:
> static DEFINE_PER_CPU(struct bp_cpuinfo, bp_cpuinfo[TYPE_MAX]);
>
> you allow to change the breakpoint type, so I'd expect
> to see some code that release slot count for old type
> and take new one (if it's available)
>
> jirka
Why is this not a concern for modify_user_hw_breakpoint() function?
next prev parent reply other threads:[~2017-11-08 15:51 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAMmz+Y=Py0dw63tuww+Oa4rWi_Hghhs3DHmNX=Tf1Yt_JH4O+Q@mail.gmail.com>
2017-11-06 9:23 ` [PATCH] perf/core: fast breakpoint modification via _IOC_MODIFY_BREAKPOINT Jiri Olsa
[not found] ` <CAMmz+YkB955Na6wOMmgqZX_TxqsBh86FiLi8EXmOrg1vwm-fGA@mail.gmail.com>
2017-11-08 14:15 ` Jiri Olsa
2017-11-08 15:02 ` Milind Chabbi
2017-11-08 15:12 ` Jiri Olsa
2017-11-08 15:51 ` Milind Chabbi [this message]
2017-11-08 15:57 ` Jiri Olsa
2017-11-08 16:59 ` Milind Chabbi
2017-11-09 7:52 ` Jiri Olsa
2017-11-09 13:12 ` Jiri Olsa
2017-11-09 18:59 ` Milind Chabbi
2017-11-12 19:09 ` Milind Chabbi
2017-11-13 7:46 ` Jiri Olsa
2017-11-13 8:02 ` Milind Chabbi
2017-11-26 19:31 ` Jiri Olsa
2017-11-27 6:43 ` [PATCH] perf/core: Enable the bp only if the .disable field is 0 Milind Chabbi
2017-11-27 6:50 ` Milind Chabbi
2017-11-27 9:25 ` Jiri Olsa
[not found] <CAMmz+YnaoN3-7DN5WysQvhWNyGhM7_WDz5AQAnvP6FO_GMnMgw@mail.gmail.com>
2017-11-06 15:03 ` [PATCH] perf/core: fast breakpoint modification via _IOC_MODIFY_BREAKPOINT Arnaldo Carvalho de Melo
2017-11-06 22:09 Milind Chabbi
2017-11-06 23:16 ` Andi Kleen
2017-11-07 8:15 ` Peter Zijlstra
2017-11-07 17:09 ` Andi Kleen
2017-11-07 8:14 ` Peter Zijlstra
2017-11-07 15:43 ` Milind Chabbi
2017-11-07 17:24 ` Andi Kleen
2017-11-07 17:42 ` Milind Chabbi
2017-11-07 19:01 ` Peter Zijlstra
2017-11-07 19:31 ` Milind Chabbi
2017-11-08 13:35 ` kbuild test robot
2017-11-08 13:51 ` kbuild test robot
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