linux-kernel - Re: [PATCH] arm64: mm: enable per pmd page table lock

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Message-ID: <f67b5468-2144-c51f-6cf0-ea7ece93b502@arm.com>
Date:   Tue, 19 Feb 2019 08:38:54 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Yu Zhao <yuzhao@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Cc:     "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nick Piggin <npiggin@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] arm64: mm: enable per pmd page table lock



On 02/15/2019 02:46 AM, Yu Zhao wrote:
> Switch from per mm_struct to per pmd page table lock by enabling
> ARCH_ENABLE_SPLIT_PMD_PTLOCK. This provides better granularity for
> large system.
> 
> I'm not sure if there is contention on mm->page_table_lock. Given
> the option comes at no cost (apart from initializing more spin
> locks), why not enable it now.
> 

This has similar changes to what I had posted part of the general page table
page accounting clean up series on arm64 last month.

https://www.spinics.net/lists/arm-kernel/msg701954.html