linux-kernel - Re: [PATCH] perf: excluding "." and ".." directories when calculating tids.

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Date:	Thu, 17 Jun 2010 11:11:35 +0800
From:	Gui Jianfeng <guijianfeng@...fujitsu.com>
To:	Adam Schrotenboer <adam@...ris.net>
CC:	mingo@...e.hu,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf: excluding "." and ".." directories when calculating
 tids.

Adam Schrotenboer wrote:
> On 06/15/2010 10:21 PM, Gui Jianfeng wrote:
>> Introduce a filter function to skip "." and ".." directories when calculating
>> tid number.
>>
>> Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
>> ---
>>  tools/perf/util/thread.c |   11 ++++++++++-
>>  1 files changed, 10 insertions(+), 1 deletions(-)
>>
>> diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
>> index 1f7ecd4..9a448b4 100644
>> --- a/tools/perf/util/thread.c
>> +++ b/tools/perf/util/thread.c
>> @@ -7,6 +7,15 @@
>>  #include "util.h"
>>  #include "debug.h"
>>  
>> +/* Skip "." and ".." directories */
>> +static int filter(const struct dirent *dir)
>> +{
>> +	if (dir->d_name[0] == '.')
>> +		return 0;
>> +	else
>> +		return 1;
>> +}
>> +
>>   
> 
> Is this safe? Can you _never_ have a d_name with a leading dot, like '
> .hidden' ??
> Maybe should
> if(dir->d_name[0] == '.' && (dir->d_name[1] == '\0' || (dir->d_name[1]
> == '.' && dir->d_name[2] == '\0')))
> 
> Admittedly I don't think it happens in the current procfs, but I'd want
> to be careful regardless.

Actually, we only care the numeral directories. So, even if there's a ".hidden",
it's fine to filter out this directory. Just keep things simple here.

Thanks,
Gui

> 
> 

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