From mboxrd@z Thu Jan  1 00:00:00 1970
From: Robin Holt <holt@sgi.com>
Date: Fri, 15 Aug 2008 12:01:13 +0000
Subject: Re: ia64 allmodconfig on current mainline
Message-Id: <20080815120113.GN6824@sgi.com>
List-Id: <linux-ia64.vger.kernel.org>
References: <20080812150608.231a948a.akpm@linux-foundation.org> <200808130022.50501.rjw@sisk.pl> <20080812155806.4e8554a9.akpm@linux-foundation.org> <57C9024A16AD2D4C97DC78E552063EA30844B247@orsmsx505.amr.corp.intel.com>
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To: "Luck, Tony" <tony.luck@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, "Rafael J. Wysocki" <rjw@sisk.pl>, "linux-ia64@vger.kernel.org" <linux-ia64@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>

On Tue, Aug 12, 2008 at 05:21:09PM -0700, Luck, Tony wrote:
> > /opt/crosstool/gcc-3.4.5-glibc-2.3.6/ia64-unknown-linux-gnu/bin/ia64-unknown-linux-gnu-ld: section .data [0000000004ea0000 -> 0000000004f656e7] overlaps section .data.percpu [0000000004e90000 -> 0000000004ea0d17]
> 
> This means there is too much DEFINE_PER_CPU() going on.  Current
> ia64 limit for the sum of all per cpu objects is 64K.  For a
> build using defconfig we seem to be close (56K/64K ... look for
> the address of __per_cpu_end and see how close it is to the top
> of the address space: 0xffffffffffffffff).

Not sure if anybody is looking into this.  Just tried a compile of generic
and allmod.  The differences are not that significant with the exception
of per_cpu__kmem_cache_cpu at 0x28a0.  A couple other low-hanging fruit
here are per_cpu__shadow_flush_counts and per_cpu__mmu_gathers each of
which takes approx 16k.

Thanks,
Robin