Re: [RFC PATCH 2/2] swsusp: make it possible to hibernate to device mapper devices
Askar Safin <[email protected]> Tue, 23 Dec 2025 09:33:55 +0300
| Newsgroups | dev.linux.lists.linux-lvm,dev.linux.lists.dm-devel,dev.linux.lists.lvm-devel,org.kernel.vger.linux-block,org.kernel.vger.linux-btrfs,org.kernel.vger.linux-crypto,org.kernel.vger.linux-pm,org.kernel.vger.linux-raid,org.kvack.linux-mm |
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| Message-ID | <[email protected]> |
Milan Broz <[email protected]>: > Anyway, my understanding is that all device-mapper targets use mempools, > which should ensure that they can process even under memory pressure. Okay, I just read some more code and docs. dm-integrity fortunately uses bufio for checksums only. And bufio allocates memory without __GFP_IO (thus allocation should not lead to recursion). And bufio claims that "dm-bufio is resistant to allocation failures": https://elixir.bootlin.com/linux/v6.19-rc2/source/drivers/md/dm-bufio.c#L1603 . This still seems to be fragile. So I will change mode to 'D' and hope for the best. :) -- Askar Safin