From: Joe Perches <joe@perches.com>
To: Konstantin Khlebnikov <koct9i@gmail.com>,
Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Sam Varshavchik <mrsam@courier-mta.com>,
Ingo Molnar <mingo@kernel.org>, Laura Abbott <labbott@redhat.com>,
Brent <fix@bitrealm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Christian Borntraeger <borntraeger@de.ibm.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [REGRESSION] RLIMIT_DATA crashes named
Date: Sat, 17 Sep 2016 14:52:31 -0700 [thread overview]
Message-ID: <1474149151.1954.4.camel@perches.com> (raw)
In-Reply-To: <CALYGNiN-ELbwSV0X2_FeKvGSOfRuHMsBnBDj86NHZxQKnZgVsQ@mail.gmail.com>
On Sun, 2016-09-18 at 00:40 +0300, Konstantin Khlebnikov wrote:
> #define printk_periodic(period, fmt, ...)
> ({
> static unsigned long __prev __read_mostly = INITIAL_JIFFIES - (period);
> unsigned long __now = jiffies;
> bool __print = !time_in_range_open(__now, __prev, __prev + (period));
>
> if (__print) {
> __prev = __now;
> printk(fmt, ##__VA_ARGS__);
> }
> unlikely(__print);
> })
printk_periodic reads like a thing that would create a
thread to printk a message every period.
And trivially, period should be copied to a temporary
and not be reused (use your choice of # of underscores)
unsigned long _period = period;
unsigned long _now = now;
static unsigned long _prev __read_mostly = etc...
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prev parent reply other threads:[~2016-09-17 21:52 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-16 15:16 Laura Abbott
2016-09-16 17:46 ` Linus Torvalds
2016-09-16 20:10 ` Laura Abbott
2016-09-16 20:32 ` Linus Torvalds
2016-09-16 22:30 ` Sam Varshavchik
2016-09-16 23:58 ` Linus Torvalds
2016-09-17 0:04 ` Linus Torvalds
2016-09-17 4:08 ` Joe Perches
2016-09-17 8:33 ` Konstantin Khlebnikov
2016-09-17 9:09 ` Cyrill Gorcunov
2016-09-17 12:09 ` Konstantin Khlebnikov
2016-09-17 12:20 ` Cyrill Gorcunov
2016-09-17 21:40 ` Konstantin Khlebnikov
2016-09-17 21:52 ` Joe Perches [this message]
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