linux-kernel - Re: [PATCH v2] hugetlbfs: Disable softIRQ when taking hugetlb

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Message-ID: <87a77yv4xf.fsf@linux.intel.com>
Date:   Wed, 11 Dec 2019 15:05:48 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Waiman Long <longman@...hat.com>
Cc:     Mike Kravetz <mike.kravetz@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v2] hugetlbfs: Disable softIRQ when taking hugetlb_lock

Waiman Long <longman@...hat.com> writes:
>
> Currently, only free_huge_page() is known to be called from softIRQ
> context.

Called from a timer?

Perhaps just move that to a work queue instead.

That seems preferable than to increase softirq latency.

-Andi