linux-kernel - Re: [PATCH v3 0/5] page allocation tag compression

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Message-Id: <20241014163231.9ef058c82de8a6073b3edfdc@linux-foundation.org>
Date: Mon, 14 Oct 2024 16:32:31 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: kent.overstreet@...ux.dev, corbet@....net, arnd@...db.de,
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Subject: Re: [PATCH v3 0/5] page allocation tag compression

On Mon, 14 Oct 2024 13:36:41 -0700 Suren Baghdasaryan <surenb@...gle.com> wrote:

> Patch #2 copies module tags into virtually contiguous memory which
> serves two purposes:
> - Lets us deal with the situation when module is unloaded while there
> are still live allocations from that module. Since we are using a copy
> version of the tags we can safely unload the module. Space and gaps in
> this contiguous memory are managed using a maple tree.

Does this make "lib: alloc_tag_module_unload must wait for pending
kfree_rcu calls" unneeded?  If so, that patch was cc:stable
(justifyably), so what to do about that?