linux-kernel - Re: [PATCH] Revert "mm/vunmap: add cond_resched() in vunmap_pmd

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Date:   Tue, 17 Nov 2020 13:56:32 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm <linux-mm@...ck.org>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Harish Sriram <harish@...ux.ibm.com>, stable@...r.kernel.org
Subject: Re: [PATCH] Revert "mm/vunmap: add cond_resched() in
 vunmap_pmd_range"

Btw, I remember that the whole vmalloc magic in zsmalloc was only giving
a small benefit for a few niche use cases.  Given that it generally has
very strange interaction with the vmalloc core, including using various
APIs not used by any driver I'm going to ask once again why we can't
just drop the CONFIG_ZSMALLOC_PGTABLE_MAPPING case entirely?