linux-kernel - Re: [PATCH] mm: introduce MADV_CLR

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Message-ID: <20170522114243.2wrdbncilozygbpl@node.shutemov.name>
Date:   Mon, 22 May 2017 14:42:43 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Mike Rapoport <rppt@...ux.vnet.ibm.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        linux-mm <linux-mm@...ck.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: introduce MADV_CLR_HUGEPAGE

On Mon, May 22, 2017 at 09:12:42AM +0300, Mike Rapoport wrote:
> Currently applications can explicitly enable or disable THP for a memory
> region using MADV_HUGEPAGE or MADV_NOHUGEPAGE. However, once either of
> these advises is used, the region will always have
> VM_HUGEPAGE/VM_NOHUGEPAGE flag set in vma->vm_flags.
> The MADV_CLR_HUGEPAGE resets both these flags and allows managing THP in
> the region according to system-wide settings.

Seems reasonable. But could you describe an use-case when it's useful in
real world.

And the name is bad. But I don't have better suggestion. At least do not
abbreviate CLEAR. Saving two letters doesn't worth it.

Maybe RESET instead?

-- 
 Kirill A. Shutemov