netdev - Re: [PATCH] prevent the read ahead of /proc/slabinfo in ss

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Message-ID: <CAC2pzGdS4UuniF5cFpvgjbfvtX7q9JGDe0WAvYGBQNXxhNy18w@mail.gmail.com>
Date:	Thu, 12 Feb 2015 09:21:44 +0800
From:	Bryton Lee <brytonlee01@...il.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	stephen@...workplumber.org, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH] prevent the read ahead of /proc/slabinfo in ss - take 3

On Tue, Feb 10, 2015 at 8:51 PM, Sergei Shtylyov
<sergei.shtylyov@...entembedded.com> wrote:
> On 2/10/2015 8:52 AM, Bryton Lee wrote:
>
>> prevent the read ahead of /proc/slabinfo in ss.
>
>
>> Signed-off-by: Bryton Lee <brytonlee01@...il.com>
>> ---
>>   misc/ss.c | 13 ++++++++++---
>>   1 file changed, 10 insertions(+), 3 deletions(-)
>
>
>> diff --git a/misc/ss.c b/misc/ss.c
>> index 7fc0a99..74721b5 100644
>> --- a/misc/ss.c
>> +++ b/misc/ss.c
>
> [...]
>>
>> @@ -655,6 +656,8 @@ static int get_slabstat(struct slabstat *s)
>>                         break;
>>         }
>>
>> +    slabstat_valid = 1;
>
>
>    This is indented incorrectly. Use one TAB please.
>
>> +
>>         fclose(fp);
>>         return 0;
>>   }
>> @@ -2230,6 +2233,9 @@ static int tcp_show(struct filter *f, int socktype)
>>          * it is able to give us some memory for snapshot.
>>          */
>>         if (1) {
>> +               if (!slabstat_valid)
>> +                       get_slabstat(&slabstat);
>> +
>>                 int guess = slabstat.socks+slabstat.tcp_syns;
>>                 if (f->states&(1<<SS_TIME_WAIT))
>>                         guess += slabstat.tcp_tws;
>> @@ -3196,6 +3202,9 @@ static int print_summary(void)
>>         if (get_snmp_int("Tcp:", "CurrEstab", &sn.tcp_estab) < 0)
>>                 perror("ss: get_snmpstat");
>>
>> +       if (!slabstat_valid)
>> +               get_slabstat(&slabstat);
>> +
>
>
>    Can't you perform this check inside get_slabstat()?
>

OK, I can submit it in another mail, coming soon.

> [...]
>
> WBR, Sergei
>



-- 
Best Regards

Bryton.Lee
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