linux-kernel - Re: [PATCH] perf mem/c2c: Fix perf_mem

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]

Date:   Tue, 29 Jan 2019 20:45:44 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>, acme@...nel.org
Cc:     jolsa@...hat.com, namhyung@...nel.org, dzickus@...hat.com,
        fowles@...each.com, jmario@...hat.com,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        maddy@...ux.vnet.ibm.com
Subject: Re: [PATCH] perf mem/c2c: Fix perf_mem_events to support powerpc

Ravi Bangoria <ravi.bangoria@...ux.ibm.com> writes:

> On 1/14/19 9:44 AM, Ravi Bangoria wrote:
>> Powerpc hw does not have inbuilt latency filter (--ldlat) for mem-load
>> event and, perf_mem_events by default includes ldlat=30 which is
>> causing failure on powerpc. Refactor code to support perf mem/c2c on
>> powerpc.
>> 
>> This patch depends on kernel side changes done my Madhavan:
>> https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-December/182596.html
>> 
>> Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
>
>
> Arnaldo / Michael, Any thoughts?

I haven't merged the kernel patch, I think because Maddy told me not to
because it would break the userspace tooling :)

What is the actual dependency between them? ie. should we merge the
kernel fix first or second or what?

cheers