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Message-ID: <d0ef9148-3c95-87bb-26f9-ea0920a4faa4@intel.com>
Date: Thu, 22 Jun 2023 06:37:51 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: ypodemsk@...hat.com, mtosatti@...hat.com, ppandit@...hat.com,
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Subject: Re: [PATCH v2 2/2] mm/mmu_gather: send tlb_remove_table_smp_sync IPI
only to MM CPUs
On 6/22/23 06:14, ypodemsk@...hat.com wrote:
> I will send a new version with the local variable as you suggested
> soon.
> As for the config name, what about CONFIG_ARCH_HAS_MM_CPUMASK?
The confusing part about that name is that mm_cpumask() and
mm->cpu_bitmap[] are defined unconditionally. So, they're *around*
unconditionally but just aren't updated.
BTW, it would also be nice to have _some_ kind of data behind this patch.
Fewer IPIs are better I guess, but it would still be nice if you could say:
Before this patch, /proc/interrupts showed 123 IPIs/hour for an
isolated CPU. After the approach here, it was 0.
... or something.
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