linux-kernel - Re: [PATCH] kernfs: account kernfs_node

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Message-ID: <20180129191323.GB1121507@devbig577.frc2.facebook.com>
Date:   Mon, 29 Jan 2018 11:13:23 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] kernfs: account kernfs_node_cache as reclaimable

On Fri, Jan 26, 2018 at 02:47:20PM -0800, Cong Wang wrote:
> Similar to commit df206988e03e
> ("fs: fuse: account fuse_inode slab memory as reclaimable"), these
> kernfs nodes are currently included in the unreclaimable slab counts -
> SUnreclaim in /proc/meminfo. And they are reclaimable too and can be
> freed by kernfs_evict_inode() via /proc/sys/vm/drop_caches easily.

That evicts the inode, not the kernfs_node.  kernfs_node is the
backing storage for these filesystems.  They aren't reclaimable.

Thanks.

-- 
tejun