linux-kernel - Re: [PATCH] mm/hugetlb: Get rid of NODEMASK

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Message-ID: <20190403054436.GA20228@hori.linux.bs1.fc.nec.co.jp>
Date:   Wed, 3 Apr 2019 05:44:35 +0000
From:   Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:     Oscar Salvador <osalvador@...e.de>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mike.kravetz@...cle.com" <mike.kravetz@...cle.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/hugetlb: Get rid of NODEMASK_ALLOC

On Tue, Apr 02, 2019 at 03:34:15PM +0200, Oscar Salvador wrote:
> NODEMASK_ALLOC is used to allocate a nodemask bitmap, ant it does it by
> first determining whether it should be allocated in the stack or dinamically
> depending on NODES_SHIFT.
> Right now, it goes the dynamic path whenever the nodemask_t is above 32
> bytes.
> 
> Although we could bump it to a reasonable value, the largest a nodemask_t
> can get is 128 bytes, so since __nr_hugepages_store_common is called from
> a rather shore stack we can just get rid of the NODEMASK_ALLOC call here.
> 
> This reduces some code churn and complexity.
> 
> Signed-off-by: Oscar Salvador <osalvador@...e.de>

nice cleanup.

Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>