linux-kernel - Re: [PATCH 1/2] btrfs: zoned: use rcu list for iterating devices to collect stats

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Message-ID: <xow7peddc2x5dyrttecs2evtw2vtaf537ed4cyzpp2htbufcjp@ul7zzkmkfcps>
Date: Mon, 22 Jan 2024 12:12:25 +0000
From: Naohiro Aota <Naohiro.Aota@....com>
To: Johannes Thumshirn <Johannes.Thumshirn@....com>
CC: Josef Bacik <josef@...icpanda.com>, David Sterba <dsterba@...e.com>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Damien Le Moal
	<dlemoal@...nel.org>
Subject: Re: [PATCH 1/2] btrfs: zoned: use rcu list for iterating devices to
 collect stats

On Mon, Jan 22, 2024 at 02:51:03AM -0800, Johannes Thumshirn wrote:
> As btrfs_zoned_should_reclaim only has to iterate the device list in order
> to collect stats on the device's total and used bytes, we don't need to
> take the full blown mutex, but can iterate the device list in a rcu_read
> context.
> 
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@....com>

Looks good.

Reviewed-by: Naohiro Aota <naohiro.aota@....com>