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Date:   Sun, 15 Nov 2020 12:18:28 +0000
From:   Matthew Wilcox <willy@infradead.org>
To:     Dongli Zhang <dongli.zhang@oracle.com>
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Subject: Re: [PATCH v2 1/1] page_frag: Recover from memory pressure
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On Sat, Nov 14, 2020 at 10:51:06PM -0800, Dongli Zhang wrote:
> +		if (nc->pfmemalloc) {

You missed the unlikely() change that Eric recommended.