From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: Anton Blanchard <anton@samba.org>, Michael Ellerman <mpe@ellerman.id.au>
Cc: paulus@samba.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] powerpc/mm: Add trace point for tracking hash pte fault
Date: Mon, 02 Feb 2015 21:51:55 +0530 [thread overview]
Message-ID: <87vbjk707w.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <20150202212607.7585dedb@kryten>
Anton Blanchard <anton@samba.org> writes:
> Hi,
>
>> > ebizzy with -S 30 -t 1 -P gave
>> > 13627 records/s -> Without patch
>> > 13546 records/s -> With patch with tracepoint disabled
>>
>> OK. So that's about -0.6%. Are we happy with that? I'm not sure.
>>
>> Can you do a few more runs and see if that's a stable result.
>
> Surprisingly large. Is CONFIG_JUMP_LABEL enabled? That should reduce the
> tracepoint to just a nop.
yes. We do use jump label. I also verified that looking at .s
#APP
# 23 "./arch/powerpc/include/asm/jump_label.h" 1
1:
nop
.pushsection __jump_table, "aw"
.llong 1b, .L201, __tracepoint_hash_fault+8 #,
.popsection
# 0 "" 2
.....
-aneesh
next prev parent reply other threads:[~2015-02-02 16:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-20 11:35 [PATCH] powerpc/mm: Add trace point for tracking hash pte fault Aneesh Kumar K.V
2015-01-21 3:07 ` Michael Ellerman
2015-01-21 8:45 ` Aneesh Kumar K.V
2015-01-28 6:11 ` Michael Ellerman
2015-02-02 10:26 ` Anton Blanchard
2015-02-02 16:21 ` Aneesh Kumar K.V [this message]
2015-02-02 22:01 ` Anton Blanchard
2015-02-03 3:07 ` Aneesh Kumar K.V
2015-02-02 16:12 ` Aneesh Kumar K.V
2015-04-02 8:44 ` Aneesh Kumar K.V
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