linux-kernel - Re: [patch 1/2] mm, shmem: add vmstat for hugepage fallback

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Date:   Mon, 9 Mar 2020 18:48:10 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     David Rientjes <rientjes@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Yang Shi <shy828301@...il.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Jeremy Cline <jcline@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: [patch 1/2] mm, shmem: add vmstat for hugepage fallback

On Fri, Mar 06, 2020 at 02:22:32PM -0800, David Rientjes wrote:
> The existing thp_fault_fallback indicates when thp attempts to allocate a
> hugepage but fails, or if the hugepage cannot be charged to the mem cgroup
> hierarchy.
> 
> Extend this to shmem as well.  Adds a new thp_file_fallback to complement
> thp_file_alloc that gets incremented when a hugepage is attempted to be
> allocated but fails, or if it cannot be charged to the mem cgroup
> hierarchy.
> 
> Additionally, remove the check for CONFIG_TRANSPARENT_HUGE_PAGECACHE from
> shmem_alloc_hugepage() since it is only called with this configuration
> option.
> 
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov