From: Eric Dumazet <eric.dumazet@gmail.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Jiri Kosina <jkosina@suse.cz>, Jeff Mahoney <jeffm@suse.com>,
Peter Zijlstra <peterz@infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Tony Luck <tony.luck@intel.com>,
Fenghua Yu <fenghua.yu@intel.com>,
linux-ia64@vger.kernel.org
Subject: Re: Commit 34d76c41 causes linker errors on ia64 with NR_CPUS=4096
Date: Tue, 20 Oct 2009 07:11:38 +0000 [thread overview]
Message-ID: <4ADD62AA.8060503@gmail.com> (raw)
In-Reply-To: <20091020063555.GJ8550@elte.hu>
Ingo Molnar a écrit :
> Still looks like a bug if it causes a breakage (linker error) on IA64,
> and if the 'fix' (i'd call it a workaround) causes a (small but nonzero)
> performance regression on other architectures.
>
True, but this also save some amount of ram for some distro kernels.
If we keep this static NR_CPUS thing, we might be able to free
the end of table, for other per_cpu users ?
if (nr_cpus_ids < NR_CPUS) {
per_cpu_free_static_zone(&update_shares_data[nr_cpus_ids],
sizeof(long)*(NR_CPUS - nr_cpus_ids));
}
WARNING: multiple messages have this Message-ID (diff)
From: Eric Dumazet <eric.dumazet@gmail.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Jiri Kosina <jkosina@suse.cz>, Jeff Mahoney <jeffm@suse.com>,
Peter Zijlstra <peterz@infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Tony Luck <tony.luck@intel.com>,
Fenghua Yu <fenghua.yu@intel.com>,
linux-ia64@vger.kernel.org
Subject: Re: Commit 34d76c41 causes linker errors on ia64 with NR_CPUS=4096
Date: Tue, 20 Oct 2009 09:11:38 +0200 [thread overview]
Message-ID: <4ADD62AA.8060503@gmail.com> (raw)
In-Reply-To: <20091020063555.GJ8550@elte.hu>
Ingo Molnar a écrit :
> Still looks like a bug if it causes a breakage (linker error) on IA64,
> and if the 'fix' (i'd call it a workaround) causes a (small but nonzero)
> performance regression on other architectures.
>
True, but this also save some amount of ram for some distro kernels.
If we keep this static NR_CPUS thing, we might be able to free
the end of table, for other per_cpu users ?
if (nr_cpus_ids < NR_CPUS) {
per_cpu_free_static_zone(&update_shares_data[nr_cpus_ids],
sizeof(long)*(NR_CPUS - nr_cpus_ids));
}
next prev parent reply other threads:[~2009-10-20 7:11 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-18 22:28 Commit 34d76c41 causes linker errors on ia64 with NR_CPUS=4096 Jeff Mahoney
2009-10-20 2:02 ` Jiri Kosina
2009-10-20 2:02 ` Jiri Kosina
2009-10-20 4:57 ` Jiri Kosina
2009-10-20 4:57 ` Jiri Kosina
2009-10-20 5:21 ` Tejun Heo
2009-10-20 5:21 ` Tejun Heo
2009-10-20 5:58 ` Jiri Kosina
2009-10-20 5:58 ` Jiri Kosina
2009-10-20 6:12 ` Tejun Heo
2009-10-20 6:12 ` Tejun Heo
2009-10-20 6:14 ` Tejun Heo
2009-10-20 6:14 ` Tejun Heo
2009-10-20 6:27 ` Jiri Kosina
2009-10-20 6:27 ` Jiri Kosina
2009-10-20 14:18 ` Jeff Mahoney
2009-10-20 14:18 ` Jeff Mahoney
2009-10-20 14:49 ` Jeff Mahoney
2009-10-20 14:49 ` Jeff Mahoney
2009-10-21 6:11 ` Ingo Molnar
2009-10-21 6:11 ` Ingo Molnar
2009-10-21 15:19 ` Tejun Heo
2009-10-21 15:19 ` Tejun Heo
2009-10-21 22:11 ` Luck, Tony
2009-10-21 22:11 ` Luck, Tony
2009-10-22 14:49 ` Jiri Kosina
2009-10-22 14:49 ` Jiri Kosina
2009-10-22 14:53 ` Jeff Mahoney
2009-10-22 14:53 ` Jeff Mahoney
2009-10-22 22:24 ` Luck, Tony
2009-10-22 22:24 ` Luck, Tony
2009-10-23 7:51 ` Ingo Molnar
2009-10-23 7:51 ` Ingo Molnar
2009-10-23 12:30 ` Jiri Kosina
2009-10-23 12:30 ` Jiri Kosina
2009-10-26 16:38 ` Jiri Kosina
2009-10-26 16:38 ` Jiri Kosina
2009-10-26 20:16 ` Ingo Molnar
2009-10-26 20:16 ` Ingo Molnar
2009-10-27 10:03 ` Jiri Kosina
2009-10-27 10:03 ` Jiri Kosina
2009-10-27 10:52 ` Jiri Kosina
2009-10-27 10:52 ` Jiri Kosina
2009-10-20 6:15 ` Ingo Molnar
2009-10-20 6:15 ` Ingo Molnar
2009-10-20 6:26 ` Jiri Kosina
2009-10-20 6:26 ` Jiri Kosina
2009-10-20 6:35 ` Ingo Molnar
2009-10-20 6:35 ` Ingo Molnar
2009-10-20 7:11 ` Eric Dumazet [this message]
2009-10-20 7:11 ` Eric Dumazet
2009-10-20 7:39 ` Tejun Heo
2009-10-20 7:39 ` Tejun Heo
2009-10-20 7:12 ` Tejun Heo
2009-10-20 7:12 ` Tejun Heo
2009-10-20 7:17 ` Jiri Kosina
2009-10-20 7:17 ` Jiri Kosina
2009-10-20 7:36 ` Tejun Heo
2009-10-20 7:36 ` Tejun Heo
2009-10-20 13:08 ` Jeff Mahoney
2009-10-20 13:08 ` Jeff Mahoney
2009-10-20 13:43 ` Ingo Molnar
2009-10-20 13:43 ` Ingo Molnar
2009-10-20 13:57 ` Tejun Heo
2009-10-20 13:57 ` Tejun Heo
2009-10-20 13:58 ` Tejun Heo
2009-10-20 13:58 ` Tejun Heo
2009-10-21 6:43 ` Christoph Lameter
2009-10-21 6:43 ` Christoph Lameter
2009-10-20 9:21 ` Peter Zijlstra
2009-10-20 9:21 ` Peter Zijlstra
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