From: Michael Ellerman <mpe@ellerman•id.au>
To: Christophe Leroy <christophe.leroy@c-s•fr>
Cc: Benjamin Herrenschmidt <benh@kernel•crashing.org>,
Paul Mackerras <paulus@samba•org>,
scottwood@freescale•com, linux-kernel@vger•kernel.org,
linuxppc-dev@lists•ozlabs.org,
Joakim Tjernlund <joakim.tjernlund@transmode•se>
Subject: Re: [PATCH] powerpc/book3s32: Only select PPC_HAVE_PMU on e600
Date: Thu, 03 Sep 2015 19:47:29 +1000 [thread overview]
Message-ID: <1441273649.26379.3.camel@ellerman.id.au> (raw)
In-Reply-To: <20150903092704.2F4881A241D@localhost.localdomain>
On Thu, 2015-09-03 at 11:27 +0200, Christophe Leroy wrote:
> On PPC832x, perf record/report reports martian addresses
>
> 2.62% perf_reseau4 libpthread-2.18.so [.] __libc_send
> 2.56% perf_reseau4 [kernel.kallsyms] [k] __ip_make_skb
> 1.62% perf_reseau4 [kernel.kallsyms] [k] __ip_append_data.isra.39
> 1.55% perf_reseau4 [kernel.kallsyms] [k] ip_finish_output
> 1.33% perf_reseau4 [unknown] [k] 0x7ffffd94
> 1.33% perf_reseau4 [unknown] [k] 0x7ffffd95
> 1.28% perf_reseau4 [unknown] [k] 0x7ffffd97
> 1.26% perf_reseau4 [unknown] [k] 0x7ffffda3
> 1.24% perf_reseau4 [unknown] [k] 0x7ffffd98
> 1.22% perf_reseau4 [unknown] [k] 0x7ffffd92
> 1.22% perf_reseau4 [unknown] [k] 0x7ffffd9b
> [.....]
>
> This is due to function perf_instruction_pointer() reading SPR SIAR
> which doesn't exist on e300 core. The perf_instruction_pointer() is
> redefined in arch/powerpc/perf/core-book3s.c when CONFIG_PPC_PERF_CTRS
> is selected.
>
> This patch moves the selection of CONFIG_PPC_HAVE_PMU in 86xx section
> so that CONFIG_PPC_PERF_CTRS won't be selected for other 6xx powerpc
I don't know much about these old 6xx cpus, deferring to Paul.
cheers
next prev parent reply other threads:[~2015-09-03 9:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-03 9:27 [PATCH] powerpc/book3s32: Only select PPC_HAVE_PMU on e600 Christophe Leroy
2015-09-03 9:47 ` Michael Ellerman [this message]
2015-09-04 16:43 ` Scott Wood
2015-09-04 18:00 ` christophe leroy
2015-09-04 18:31 ` Segher Boessenkool
2015-09-04 19:51 ` Segher Boessenkool
2015-09-09 22:24 ` Scott Wood
2015-09-10 0:47 ` Michael Ellerman
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