linux-kernel - Re: [PATCH 1/3] radix-tree: propagate all tags in idr tree

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Message-ID: <Yqm+jmkDA+um2+hd@infradead.org>
Date:   Wed, 15 Jun 2022 04:12:14 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Brian Foster <bfoster@...hat.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        ikent@...hat.com, onestero@...hat.com
Subject: Re: [PATCH 1/3] radix-tree: propagate all tags in idr tree

On Tue, Jun 14, 2022 at 02:09:47PM -0400, Brian Foster wrote:
> The IDR tree has hardcoded tag propagation logic to handle the
> internal IDR_FREE tag and ignore all others. Fix up the hardcoded
> logic to support additional tags.
> 
> This is specifically to support a new internal IDR_TGID radix tree
> tag used to improve search efficiency of pids with associated
> PIDTYPE_TGID tasks within a pid namespace.

Wouldn't it make sense to switch over to an xarray here rather
then adding new features to the radix tree?