Re: [Ext2-devel] [PATCH] distributed counters for ext2 to avoid

[Andrew Morton]

Matthew Wilcox <[e-mail]> wrote:
>
> Anyway, I think dcounters should probably be allocated from kmalloc_percpu()
> rather than as part of the dcounter struct.

That will still consume up to 4 kilobytes per 32-bit counter.  We'd
need to merge Kiran & Dipankar's interlace allocator to do this less
grossly.

Which is why I'm waiting to see some profiles and benchmarks.  Judging from
the last set of profiles, in which ext2_count_free_blocks() was not present,
this may not be justified.