Re: [PATCH v4] mm: Enable suspend-only swap spaces
From: Karel Zak <kzak@redhat.com>
Date: 2021-07-30 13:16:16
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On Mon, Jul 26, 2021 at 05:12:46PM -0700, Evan Green wrote:
Swap regions with SWAP_FLAG_HIBERNATE_ONLY set will not appear in /proc/meminfo under SwapTotal and SwapFree, since they are not usable as general swap. These regions do still appear in /proc/swaps.
Off-topic, /proc/swaps is in the same situation like /proc/mounts years ago ... It does not provide all important information like SWAP_FLAG_DISCARD_PAGES SWAP_FLAG_DISCARD_ONCE and SWAP_FLAG_HIBERNATE_ONLY flags. Users will not able to differentiate between regular and hibernate-only devices in "swapon" or "cat /proc/swaps" output ;-( It would be nice to have /proc/swapsinfo with extendible "flags" column. Karel -- Karel Zak [off-list ref] http://karelzak.blogspot.com