Re: [PATCH mmotm 1/5] nilfs2: fix problems of memory allocation in ioctl

From: Andi Kleen
Date: Mon Dec 15 2008 - 05:05:56 EST


On Mon, Dec 15, 2008 at 03:58:40PM +0900, Ryusuke Konishi wrote:
> On Sun, 14 Dec 2008 16:13:27 +0100, Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:
> > > -#define KMALLOC_SIZE_MIN 4096 /* 4KB */
> > > -#define KMALLOC_SIZE_MAX 131072 /* 128 KB */
> > > +#define NILFS_IOCTL_KMALLOC_SIZE 8192 /* 8KB */
> >
> > Better would be if you could go to PAGE_SIZE. order 0 allocations
> > are typically the fastest / least likely to stall.
> >
> > Also in this case it's a good idea to use __get_free_pages()
> > directly, kmalloc tends to be become less efficient at larger
> > sizes.
>
> Thanks again. I've rewritten the patch to use __get_free_pages().

Thanks looks good now.

-Andi
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