linux-ext4 - Re: [PATCH v4 0/3] ext4: increase mbcache scalability

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Message-ID: <52E30FAA.500@hp.com>
Date:	Fri, 24 Jan 2014 18:13:14 -0700
From:	Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@...com>
To:	Andi Kleen <andi@...stfloor.org>, T Makphaibulchoke <tmac@...com>
CC:	viro@...iv.linux.org.uk, tytso@....edu, adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, aswin@...com
Subject: Re: [PATCH v4 0/3] ext4: increase mbcache scalability

On 01/24/2014 02:38 PM, Andi Kleen wrote:
> T Makphaibulchoke <tmac@...com> writes:
> 
>> The patch consists of three parts.
>>
>> The first part changes the implementation of both the block and hash chains of
>> an mb_cache from list_head to hlist_bl_head and also introduces new members,
>> including a spinlock to mb_cache_entry, as required by the second part.
> 
> spinlock per entry is usually overkill for larger hash tables.
> 
> Can you use a second smaller lock table that just has locks and is 
> indexed by a subset of the hash key. Most likely a very small 
> table is good enough.
> 
> Also I would be good to have some data on the additional memory consumption.
> 
> -Andi
> 

Thanks Andi for the comments.  Will look into that.

Thanks,
Mak.

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