linux-kernel - Re: [PATCH] perf record: Conditionally define CLOCK_MONOTONIC

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Message-ID: <55252339.80807@huawei.com>
Date:	Wed, 8 Apr 2015 20:46:49 +0800
From:	Yunlong Song <yunlong.song@...wei.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	<paulus@...ba.org>, <mingo@...hat.com>, <acme@...nel.org>,
	<linux-kernel@...r.kernel.org>, <wangnan0@...wei.com>
Subject: Re: [PATCH] perf record: Conditionally define CLOCK_MONOTONIC_RAW
 for older OSes

On 2015/4/8 16:55, Peter Zijlstra wrote:
> On Wed, Apr 08, 2015 at 12:02:28PM +0800, Yunlong Song wrote:
>> Commit 31a9883106cc ("perf record: Add clockid parameter") used
>> CLOCK_MONOTONIC_RAW in the struct clockid_map clockids[], but the
>> CLOCK_MONOTONIC_RAW macro is not defined in older releases (e.g., SLES
>> 11 SP2), thus there is a building error when making perf:
>>
>> builtin-record.c:738: error: ‘CLOCK_MONOTONIC_RAW’ undeclared here (not in a function)
> 
> Weird that, CLOCK_MONOTONIC_RAW is said to be in the kernel since
> 2.6.28, SLES11 SP2 is 3.0 based, SP1 is 2.6.32.
> 
> Now the original SLES11 started life with 2.6.27, so it looks like
> someone forgot to update their kernel headers when upgrading.
> 
> 
> 
> .
> 

Hi, Peter,

SLES 11 SP2 uses linux-kernel-headers-2.6.32-1.4.13, which really defines CLOCK_MONOTONIC_RAW
in <linux/time.h>. But the perf.h which is included in builtin-record.c uses <time.h> rather
than <linux/time.h>, and <time.h> finally includes <bits/time.h>. Both <time.h> and <bits/time.h>
belong to glibc-devel package, which is glibc-devel-2.11.3-17.31.1 for SLES11 SP2, and it does
not define CLOCK_MONOTONIC_RAW indeed. However, for the latest OSes (or say distributions), the
corresponding glibc-devel packages have already defined CLOCK_MONOTONIC_RAW.

-- 
Thanks,
Yunlong Song

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