linux-ext4 - Re: [PATCH -v2] ext4: Use inode preallocation with -o noextents

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Message-ID: <484F45C9.3030804@cn.fujitsu.com>
Date:	Wed, 11 Jun 2008 11:26:01 +0800
From:	Shen Feng <shen@...fujitsu.com>
To:	Andreas Dilger <adilger@....com>
CC:	Mingming Cao <cmm@...ibm.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Theodore Tso <tytso@....edu>, sandeen@...hat.com,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH -v2] ext4: Use inode preallocation with -o noextents



Andreas Dilger Wrote:
> On Jun 05, 2008  07:55 -0700, Mingming Cao wrote:
>>>  /**
>>> - * ext4_new_blocks_old() -- core block(s) allocation function
>>> + * ext4_orlov_new_blocks() -- core block(s) allocation function
>> what is orlov means? this is core function for non extent based without
>> mballoc block allocation, right? 
> 
> Orlov is the name of the INODE allocator, not the block allocator.  I'm
> not sure there is a name for the block allocator except "old" or "bitmap".
> In the future I suspect we won't want to keep this version at all, using
> the mballoc allocator even for block-mapped files, but it is useful for
> now for performance comparisons.
> 

Is that true?

I got the following from the kernel ext4 documentation.
orlov		(*)	This enables the new Orlov block allocator. It is
			enabled by default.

oldalloc		This disables the Orlov block allocator and enables
			the old block allocator.  Orlov should have better
			performance - we'd like to get some feedback if it's
			the contrary for you.

-Shen Feng
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