Home » Mailing list archives » linux-kernel » 2008 » September » 5

[PATCH 0/3] smp: reduce stack requirements for smp_call_function_mask

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]
[view in full thread]
From: Mike Travis
Subject: [PATCH 0/3] smp: reduce stack requirements for smp_call_function_mask
Date: Friday, September 5, 2008 - 2:40 pm

* Cleanup cpumask_t usages in smp_call_function_mask function chain
    to prevent stack overflow problem when NR_CPUS=4096.

  * Reduce the number of passed cpumask_t variables in the following
    call chain for x86_64:

	smp_call_function_mask -->
	    arch_send_call_function_ipi->
		    smp_ops.send_call_func_ipi -->
			    genapic->send_IPI_mask

    Since the smp_call_function_mask() is an EXPORTED function, we
    cannot change it's calling interface for a patch to 2.6.27.

    The smp_ops.send_call_func_ipi interface is internal only and
    has two arch provided functions:

	arch/x86/kernel/smp.c:  .send_call_func_ipi = native_send_call_func_ipi
	arch/x86/xen/smp.c:     .send_call_func_ipi = xen_smp_send_call_function_ipi
	arch/x86/mach-voyager/voyager_smp.c:    (uses native_send_call_func_ipi)

    Therefore modifying the internal interface to use a cpumask_t pointer
    is straight-forward.

    The changes to genapic are much more extensive and are affected by the
    recent additions of the x2apic modes, so they will be done for 2.6.28 only.

Based on 2.6.27-rc5-git6.

Applies to linux-2.6.tip/master (with FUZZ).

Signed-off-by: Mike Travis <travis@sgi.com>
---

--
Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]
Messages in current thread:
[PATCH 0/3] smp: reduce stack requirements for smp_call_fu ..., Mike Travis, (Fri Sep 5, 2:40 pm)
Re: [PATCH 0/3] smp: reduce stack requirements for smp_cal ..., Ingo Molnar, (Sat Sep 6, 6:29 am)
Re: [PATCH 0/3] smp: reduce stack requirements for smp_cal ..., Mike Travis, (Sat Sep 6, 11:12 am)
Re: [PATCH 0/3] smp: reduce stack requirements for smp_cal ..., Ingo Molnar, (Sat Sep 6, 11:21 am)
Re: [PATCH 0/3] smp: reduce stack requirements for smp_cal ..., Jes Sorensen, (Mon Sep 8, 2:48 am)
Re: [PATCH 0/3] smp: reduce stack requirements , Nick Piggin, (Mon Sep 8, 3:30 am)
Re: [PATCH 0/3] smp: reduce stack requirements for smp_cal ..., Mike Travis, (Mon Sep 8, 8:41 am)
Re: [PATCH 0/3] smp: reduce stack requirements for smp_cal ..., Mike Travis, (Mon Sep 8, 8:47 am)
Re: [PATCH 0/3] smp: reduce stack requirements for smp_cal ..., David Miller, (Mon Sep 8, 12:51 pm)
Re: [PATCH 0/3] smp: reduce stack requirements for smp_cal ..., Mike Travis, (Mon Sep 8, 1:11 pm)
Re: [PATCH 0/3] smp: reduce stack requirements for smp_cal ..., David Miller, (Mon Sep 8, 1:48 pm)