On Jun 11, 2008 11:26 +0800, Shen Feng wrote:
> 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.
The documentation is incorrect then. The Orlov allocator is for inodes:
ialloc.c:
/*
* Orlov's allocator for directories.
struct inode *ext3_new_inode(handle_t *handle, struct inode * dir, int mode)
{
if (S_ISDIR(mode)) {
if (test_opt (sb, OLDALLOC))
group = find_group_dir(sb, dir);
else
group = find_group_orlov(sb, dir);
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
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