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SubjectRe: [PATCH 1/1] fat: improve sync performance by grouping writes in fat_mirror_bhs [really unmangled]
Hi Jörn,

Thanks for your time, I'll make those changes [along with a few other
things I noticed while benchmarking it]. Before I put together a
patch, does anyone else see any obvious stuff I should clean up?

Cheers,

Holden :-)

On 10/26/06, Jörn Engel <joern@wohnheim.fh-wedel.de> wrote:
> I didn't pay too much attention, but found some low hanging fruits.
>
> On Thu, 26 October 2006 07:59:42 -0400, Holden Karau wrote:
> >
> > -/* FIXME: We can write the blocks as more big chunk. */
> > static int fat_mirror_bhs(struct super_block *sb, struct buffer_head **bhs,
> > - int nr_bhs)
> > + int nr_bhs ) {
> > + return fat_mirror_bhs_optw(sb , bhs , nr_bhs, 0);
> > +}
> > +
> > +static int fat_mirror_bhs_optw(struct super_block *sb, struct buffer_head **bhs,
> > + int nr_bhs , int wait)
>
> Does this compile without warnings? Looks as if you should reverse
> the order of the two functions.
>
For some reason it compiles without warnings for me, but I'll switch the order.
> > {
> > struct msdos_sb_info *sbi = MSDOS_SB(sb);
> > - struct buffer_head *c_bh;
> > + struct buffer_head *c_bh[nr_bhs];
> > int err, n, copy;
> >
> > + /* Always wait if mounted -o sync */
> > + if (sb->s_flags & MS_SYNCHRONOUS ) {
> > + wait = 1;
> > + }
>
> Coding style. Use a tab for indentation and don't use braces for
> single-line conditional statements.
>
Sorry about that. A lot of the places where I used braces are because
I had some debugging output in there while I was hacking on it. I'll
change it.
> > +
> > err = 0;
> > + err = fat_sync_bhs_optw( bhs , nr_bhs , wait);
>
> The err=0; is superfluous now, isn't it?
>
.... no comment :-)
> > + if (err)
> > + goto error;
>
> Indentation.
>
oops :-) I'll fix that.
> Jörn
>
> --
> Fantasy is more important than knowledge. Knowledge is limited,
> while fantasy embraces the whole world.
> -- Albert Einstein
>


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