linux-kernel - Re: [PATCH v6 1/3] perf/core: use rb trees for pinned/flexible groups

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <87a82hxsrw.fsf@ashishki-desk.ger.corp.intel.com>
Date:   Wed, 30 Aug 2017 13:18:59 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...el.com>,
        Dmitri Prokhorov <Dmitry.Prohorov@...el.com>,
        Valery Cherepennikov <valery.cherepennikov@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Stephane Eranian <eranian@...gle.com>,
        David Carrillo-Cisneros <davidcc@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 1/3] perf/core: use rb trees for pinned/flexible groups

Alexey Budankov <alexey.budankov@...ux.intel.com> writes:

>>> Iterating cpu specific subtree like this:
>>>
>>> #define for_each_group_event(event, group, cpu, pmu, field)	 \
>>> 	for (event = rb_entry_safe(group_first(group, cpu, pmu), \
>>> 				   typeof(*event), field);	 \
>>> 	     event && event->cpu == cpu && event->pmu == pmu;	 \
>>> 	     event = rb_entry_safe(rb_next(&event->field),	 \
>>> 				   typeof(*event), field))
>> 
>> Afaict, this assumes that you are also ordering on event->pmu, which
>> should be reflected in your _less function. And also assuming that
>> group_first() is doing the right thing. Can we see the code?
>
> I didn't do ordering by PMU for this patch set. Yet more I implemented 
> groups_first() like this:

Your iterator (quoted above) begs to differ.

Regards,
--
Alex