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

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Message-ID: <874l9rsson.fsf@concordia.ellerman.id.au>
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