linux-kernel - Re: [PATCH perf/core 00/22] perf refcnt debugger API and fixes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <566A3348.4090001@huawei.com>
Date:	Fri, 11 Dec 2015 10:22:00 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	平松雅巳 / HIRAMATU，MASAMI 
	<masami.hiramatsu.pt@...achi.com>,
	"'Arnaldo Carvalho de Melo'" <acme@...nel.org>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	"Namhyung Kim" <namhyung@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	Alexei Starovoitov <ast@...mgrid.com>
Subject: Re: [PATCH perf/core  00/22] perf refcnt debugger API and fixes



On 2015/12/11 10:08, 平松雅巳 / HIRAMATU，MASAMI wrote:
> From: Wangnan (F) [mailto:wangnan0@...wei.com]
>> On 2015/12/10 23:12, 'Arnaldo Carvalho de Melo' wrote:
>>
>> [SNIP]
>>> But this requires having these special refcnt__ routines, that will make
>>> tools/perf/ code patterns for reference counts look different that the
>>> refcount patterns in the kernel :-\
>>>
>>> And would be a requirement to change the observed workload :-\
>>>
>>> Is this _strictly_ required?
>> No. The requirement should be:
>>
>>   1. The create/get/put/delete functions are non-inline (because dwarf info
>>      is not as reliable as symbol);
>>   2. From their argument list, we can always get the variable we need (the
>>      pointer of objects, the value of refcnt, etc.)
> However, we have to customize it for each application. Perf itself might be OK
> but others might have different implementation.

If limited to pairwise operations ({{m,c}alloc,strdup} vs free, open vs 
close),
I think it is possible to abstract a uniformed pattern.

Thank you.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/