linux-kernel - Re: [PATCH] Allow increasing the buffer-head per-CPU LRU size

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Date:	Mon, 7 Jul 2014 18:30:03 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Sebastien Buisson <sebastien.buisson@...l.net>
Cc:	Andi Kleen <andi@...stfloor.org>, viro@...iv.linux.org.uk,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Allow increasing the buffer-head per-CPU LRU size

> diff --git a/fs/Kconfig b/fs/Kconfig
> index c229f82..c08844c 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -268,4 +268,13 @@ endif # NETWORK_FILESYSTEMS
>  source "fs/nls/Kconfig"
>  source "fs/dlm/Kconfig"
> 
> +config BH_LRU_SIZE
> +      int
> +      range 8 64
> +      default "16"

So who sets it then? 

You need it for ext4 and quota right? So this combination
should set it at least. Something like (unested)

It would be also good to audit or test other file systems if they need the
same if that's possible.

config BH_LARGE_LRU
	bool
	depends on (EXT4_FS && QUOTA)

config BH_LRU_SIZE
....
	default "16" if BH_LARGE_LRU
	default "8" if !BH_LARGE_LRU

-Andi
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