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

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Message-ID: <52E6509E.5080103@hp.com>
Date:	Mon, 27 Jan 2014 05:27:10 -0700
From:	Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@...com>
To:	Andreas Dilger <adilger@...ger.ca>,
	Andi Kleen <andi@...stfloor.org>
CC:	T Makphaibulchoke <tmac@...com>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"tytso@....edu" <tytso@....edu>,
	"adilger.kernel@...ger.ca" <adilger.kernel@...ger.ca>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"aswin@...com" <aswin@...com>
Subject: Re: [PATCH v4 0/3] ext4: increase mbcache scalability

On 01/24/2014 11:09 PM, Andreas Dilger wrote:
> I think the ext4 block groups are locked with the blockgroup_lock that has about the same number of locks as the number of cores, with a max of 128, IIRC.  See blockgroup_lock.h. 
> 
> While there is some chance of contention, it is also unlikely that all of the cores are locking this area at the same time.  
> 
> Cheers, Andreas
> 


Thanks Andreas for the suggestion. Will try that versus adding just a new private spinlock array in mbcache and compare the performance.

Thanks,
Mak.

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