From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
To: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>,
Namhyung Kim <namhyung@kernel.org>,
linux-kernel@vger.kernel.org, srikar@linux.vnet.ibm.com,
peterz@infradead.org, oleg@redhat.com,
hegdevasant@linux.vnet.ibm.com, mingo@redhat.com,
systemtap@sourceware.org, aravinda@linux.vnet.ibm.com,
penberg@iki.fi, brendan.d.gregg@gmail.com,
"yrl.pp-manager.tt@hitachi.com" <yrl.pp-manager.tt@hitachi.com>
Subject: Re: [RFC] perf-cache command interface design
Date: Wed, 12 Nov 2014 15:26:00 -0000 [thread overview]
Message-ID: <54637C05.5090807@hitachi.com> (raw)
In-Reply-To: <20141111131030.GG4468@redhat.com>
(2014/11/11 22:10), Arnaldo Carvalho de Melo wrote:
> Em Tue, Nov 11, 2014 at 03:53:42PM +0900, Masami Hiramatsu escreveu:
>> (2014/11/10 21:23), Arnaldo Carvalho de Melo wrote:
>>> Em Mon, Nov 10, 2014 at 07:59:24PM +0900, Masami Hiramatsu escreveu:
>>>> Here is the second try for the probe-cache. This version simplifies
>>>> the synopsis, and unifies the SDT and probe caches.
>>>> Please give me your comments/ideas!
>>>>
>>>> Command-line Synopsis
>>>> =====================
>
>>>> Add elf(or symbols) and probe-caches of SDT if exists in <FILES>
>>>> perf cache --add <FILES> [--probe <SPEC>] # for user programs
>
>>> Why the --probe above? Shouldn't this be just (if you are talking about
>>> ELF files only):
>
>>> perf cache --add <FILES>
>
>> Yes, for the elf and sdt cache, we don't need --probe.
>> Note that "[]" means optional. If we would like to add some probe cache,
>> we need a spec of probe definition.
>
> I understand that, its just that it looked superfluous at that specific
> place, where you are explaining how to add ELF files.
>
>>>> perf cache --kcore <FILE> [--probe <SPEC>] # for kcore ?
>
>>> Adrian, aren't kcore files easily identifiable as such and thus could be
>>> added as:
>
>>> perf cache --add <FILES>
>
>>>> perf cache --probe <SPEC> # for the current kernel
>
>>> Why do we need a --probe here? Don't they always start with a character
>>> that is seldomly used in ELF file names and thus we could get away with
>>> not requiring --probe?
>
>> This is only for adding the probe cache (not elf, nor sdt), which requires
>> a probe definition. Moreover, I'd like to unify the specification of the
>> probe definition with perf-probe. In that case, --probe is more natural.
>
> What I meant was, what is wrong with replacing:
>
> perf cache --probe <SPEC> # for the current kernel
>
> With:
>
> perf cache --add <PROBE-SPEC> # for the current kernel
>
> And have it figure out that what is being added is a probe and do the
> right thing?
As I've said previously, PROBE-SPEC can be same as FILES (imagine that a binary
file which has same name function in the kernel.)
Moreover, PROBE-SPEC requires the target binary(or kernel module) except for
kernel probes. In that case, anyway we need -x or -m options with file-path
for --add, that is very strange.
e.g.
For me,
perf cache --add ./binary --probe '*'
looks more natural than
perf cache --add '*' -exec ./binary
since in other cases(sdt/elf), we'll just do
perf cache --add ./binary
:-/
>>>> Remove caches related to <FILES> or <BUILDIDS>
>>>> perf cache --remove <FILES>|<BUILDIDS>
>>>>
>>>> Show all probe caches(including SDT) or buildids
>>>> perf cache --list [probe|buildid]
>>>>
>>>> Delete existing probe-cache entries for kernel, <PATH> or/and <BUILDID>.
>>>> perf cacheã--probe-del [<GROUP>:]<EVENT>[@<PATH>][#<BUILDID>]
>>>
>>> Ditto, i.e. can't we just use:
>>>
>>> perf cacheã--remove [<GROUP>:]<EVENT>[@<PATH>][#<BUILDID>]
>>>
>>> And it figure out that this is a probe that is being removed?
>>
>> In most cases, it may be OK, but it is also possible to cause unexpected
>> result when mis-typing. I think if <FILE> is always starting at '/', it
>> is easy to identify.
>
> We can keep the explicit switch (--probe-del) perhaps to resolve
> ambiguities, if they happen, but make it so that it is not strictly
> required for the common case.
OK, it'll take a longer time to remove, since we need to load all caches
to find matching entries of probe caches, but is feasible.
Thank you!
--
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@hitachi.com
next prev parent reply other threads:[~2014-11-12 15:26 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-02 12:40 [PATCH v4 0/5] perf/sdt: SDT events listing/probing Hemant Kumar
2014-11-02 12:41 ` [PATCH v4 1/5] perf/sdt: ELF support for SDT Hemant Kumar
2014-11-02 12:42 ` [PATCH v4 4/5] perf/sdt: Delete SDT events from cache Hemant Kumar
2014-11-02 12:42 ` [PATCH v4 3/5] perf/sdt: Show SDT cache contents Hemant Kumar
2014-11-02 12:42 ` [PATCH v4 2/5] perf/sdt: Add SDT events into a cache Hemant Kumar
2014-11-02 12:43 ` [PATCH v4 5/5] perf/sdt: Add support to perf record to trace SDT events Hemant Kumar
2014-11-04 7:38 ` Namhyung Kim
2014-11-04 8:06 ` Hemant Kumar
2014-11-04 12:57 ` Masami Hiramatsu
[not found] ` <5459BD3E.7010804@linux.vnet.ibm.com>
2014-11-05 6:51 ` Hemant Kumar
2014-11-05 9:07 ` Masami Hiramatsu
2014-11-05 13:28 ` Arnaldo Carvalho de Melo
2014-11-05 7:06 ` Namhyung Kim
2014-11-05 9:05 ` Masami Hiramatsu
2014-11-06 2:16 ` Josh Stone
2014-11-06 5:34 ` Masami Hiramatsu
2014-11-06 7:06 ` Hemant Kumar
2014-11-06 14:56 ` Masami Hiramatsu
2014-11-07 8:21 ` [RFC] perf-cache command interface design Masami Hiramatsu
2014-11-07 8:42 ` Peter Zijlstra
2014-11-07 13:58 ` [PATCH RESEND 1/2] perf tools: Move disable_buildid_cache() to util/build-id.c Namhyung Kim
2014-11-07 13:58 ` [PATCH 2/2] perf tools: Add record.use-buildid-cache config option Namhyung Kim
2014-11-07 15:16 ` [RFC] perf-cache command interface design David Ahern
2014-11-07 15:33 ` Arnaldo Carvalho de Melo
2014-11-07 10:51 ` Hemant Kumar
2014-11-08 4:15 ` Masami Hiramatsu
2014-11-07 14:38 ` Arnaldo Carvalho de Melo
2014-11-08 4:26 ` Masami Hiramatsu
2014-11-07 14:43 ` Namhyung Kim
2014-11-08 4:38 ` Masami Hiramatsu
2014-11-10 10:59 ` Masami Hiramatsu
2014-11-10 12:23 ` Arnaldo Carvalho de Melo
2014-11-11 6:53 ` Masami Hiramatsu
2014-11-11 13:10 ` Arnaldo Carvalho de Melo
2014-11-12 15:26 ` Masami Hiramatsu [this message]
2014-11-17 3:09 ` Namhyung Kim
2014-11-17 3:17 ` Masami Hiramatsu
2014-11-17 22:09 ` Masami Hiramatsu
2014-11-18 4:51 ` Namhyung Kim
2014-11-18 11:16 ` Masami Hiramatsu
2014-11-18 4:41 ` Namhyung Kim
2014-11-18 10:32 ` Masami Hiramatsu
2014-11-17 18:59 ` Arnaldo Carvalho de Melo
2014-11-18 4:46 ` Namhyung Kim
2014-11-10 12:05 ` Hagen Paul Pfeifer
2014-11-10 12:31 ` Arnaldo Carvalho de Melo
2014-11-10 12:50 ` Peter Zijlstra
2014-11-10 13:37 ` Hagen Paul Pfeifer
2014-11-05 18:24 ` [PATCH v4 5/5] perf/sdt: Add support to perf record to trace SDT events Hemant Kumar
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