linux-kernel - Re: [V2,1/1] powerpc/perf/hv-gpci: Increase request buffer size

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Date:	Wed, 17 Feb 2016 23:41:25 +1100 (AEDT)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [V2,1/1] powerpc/perf/hv-gpci: Increase request buffer size

On Wed, 2016-10-02 at 03:24:05 UTC, Sukadev Bhattiprolu wrote:
> >From f1afe08fbc9797ff63adf03efe564a807a37cfe6 Mon Sep 17 00:00:00 2001
> From: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
> Date: Tue, 9 Feb 2016 02:47:45 -0500
> Subject: [PATCH V2 1/1] powerpc/perf/hv-gpci: Increase request buffer size
> 
> The GPCI hcall allows for a 4K buffer but we limit the buffer to 1K.
> The problem with a 1K buffer is if a request results in returning
> more values than can be accomodated in the 1K buffer the request will
> fail.
> 
> The buffer we are using is currently allocated on the stack and hence
> limited in size. Instead use a per-CPU 4K buffer like we do with 24x7
> counters (hv-24x7.c).
> 
> While here, rename the macro GPCI_MAX_DATA_BYTES to HGPCI_MAX_DATA_BYTES
> for consistency with 24x7 counters.
> 
> Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/e4f226b1580b36550727c324b4

cheers