From: "Dmitry V. Levin" <ldv@altlinux.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Jiri Olsa <jolsa@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
"Luis Claudio R. Goncalves" <lclaudio@uudg.org>,
Eugene Syromyatnikov <esyr@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/8] perf: Allow to block process in syscall tracepoints
Date: Thu, 13 Dec 2018 04:49:05 +0300 [thread overview]
Message-ID: <20181213014905.GB26172@altlinux.org> (raw)
In-Reply-To: <20181212202639.1978ec88@vmware.local.home>
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On Wed, Dec 12, 2018 at 08:26:39PM -0500, Steven Rostedt wrote:
> On Thu, 13 Dec 2018 03:39:38 +0300, wrote:
>
> > btw, I didn't ask for the implementation to be ugly.
> > You don't have to introduce polling into the kernel if you don't want to,
> > userspace is perfectly capable of invoking wait4(2) in a loop.
> > Just block the tracee, notify the tracer, and let it pick up the pieces.
>
> Note, there's been some discussion offlist to only have perf set a flag
> when it dropped an event and have the ptrace code do the heavy lifting
> of blocking the task and waking it back up. I think that would be a
> cleaner solution and wont muck with perf as badly.
Yes, if perf could be instructed to invoke something like
tracehook_report_syscall_entry/exit when it drops the event
of entering/exiting syscall, that should probably be enough
for the ptracer to do the recovery.
--
ldv
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next prev parent reply other threads:[~2018-12-13 1:49 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-05 16:05 [RFC 1/8] perf: Block perf calls for system call tracepoints Jiri Olsa
2018-12-05 16:05 ` [PATCH 1/8] perf: Allow to block process in syscall tracepoints Jiri Olsa
2018-12-05 17:35 ` Steven Rostedt
2018-12-05 17:56 ` Jiri Olsa
2018-12-06 8:09 ` Peter Zijlstra
2018-12-06 10:30 ` Jiri Olsa
2018-12-06 8:10 ` Peter Zijlstra
2018-12-06 8:24 ` Jiri Olsa
2018-12-06 10:31 ` Peter Zijlstra
2018-12-06 8:34 ` Peter Zijlstra
2018-12-06 10:31 ` Jiri Olsa
2018-12-06 18:19 ` Steven Rostedt
2018-12-07 8:44 ` Jiri Olsa
2018-12-07 8:58 ` Peter Zijlstra
2018-12-07 13:41 ` Steven Rostedt
2018-12-07 15:11 ` Peter Zijlstra
2018-12-07 15:49 ` Arnaldo Carvalho de Melo
2018-12-08 10:41 ` Peter Zijlstra
2018-12-08 17:34 ` Steven Rostedt
2018-12-07 20:14 ` Steven Rostedt
2018-12-08 10:44 ` Peter Zijlstra
2018-12-08 17:38 ` Steven Rostedt
2018-12-10 10:18 ` Peter Zijlstra
2018-12-13 0:39 ` Dmitry V. Levin
2018-12-13 1:26 ` Steven Rostedt
2018-12-13 1:49 ` Dmitry V. Levin [this message]
2018-12-13 10:01 ` Peter Zijlstra
2018-12-13 10:05 ` Peter Zijlstra
2018-12-13 10:08 ` Peter Zijlstra
2018-12-13 11:29 ` Jiri Olsa
2018-12-06 8:17 ` Peter Zijlstra
2018-12-06 10:27 ` Jiri Olsa
2018-12-05 16:05 ` [PATCH 2/8] perf tools: Sync uapi perf_event.h Jiri Olsa
2018-12-05 16:05 ` [PATCH 3/8] perf record: Add --block option Jiri Olsa
2018-12-05 16:05 ` [PATCH 4/8] perf trace: " Jiri Olsa
2018-12-05 16:05 ` [PATCH 5/8] perf tools: Add block term support for tracepoints Jiri Olsa
2018-12-05 16:05 ` [PATCH 6/8] perf tools: Add ordered_events__flush_time interface Jiri Olsa
2018-12-14 21:00 ` [tip:perf/core] perf ordered_events: " tip-bot for Jiri Olsa
2018-12-18 14:27 ` tip-bot for Jiri Olsa
2018-12-05 16:05 ` [PATCH 7/8] perf trace: Move event delivery to deliver_event function Jiri Olsa
2018-12-14 21:01 ` [tip:perf/core] perf trace: Move event delivery to a new deliver_event() function tip-bot for Jiri Olsa
2018-12-18 14:28 ` tip-bot for Jiri Olsa
2018-12-05 16:05 ` [PATCH 8/8] perf trace: Add ordered processing for --block option Jiri Olsa
2018-12-14 21:02 ` [tip:perf/core] perf trace: Add ordered processing tip-bot for Jiri Olsa
2018-12-18 14:29 ` tip-bot for Jiri Olsa
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