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SubjectRe: splice: move balance_dirty_pages_ratelimited() outside of splice actor
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On Tue, 2007-06-12 at 14:10 +0200, Jens Axboe wrote:
> On Tue, Jun 12 2007, Peter Zijlstra wrote:
> > On Tue, 2007-06-12 at 13:31 +0200, Jens Axboe wrote:
> >
> > > Would you prefer this change, then? I'd prefer keeping the current code,
> > > unless it's absolutely critical that we call
> > > balance_dirty_pages_ratelimited() for each and every page instead of eg
> > > every 16 pages here.
> >
> > For that we should call:
> > balance_dirty_pages_ratelimited_nr(mapping, nr);
> >
> > Which is ok, for small nr.
>
> OK, then this should be better:
>
> diff --git a/fs/splice.c b/fs/splice.c
> index 25ec9c8..ed40967 100644
> --- a/fs/splice.c
> +++ b/fs/splice.c
> @@ -844,6 +883,9 @@ generic_file_splice_write_nolock(struct pipe_inode_info *pipe, struct file *out,
> sd.file = out;
> ret = __splice_from_pipe(pipe, &sd, pipe_to_file);
> if (ret > 0) {
> + unsigned long nr_pages;
> +
> + nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;

perhaps?
nr_pages = DIV_ROUND_UP(ret, PAGE_CACHE_SIZE);

not sure how horrid that turns out to be; you never know with gcc.

Otherwise, looks good.

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