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SubjectRe: seq_file: Use larger buffer to reduce time traversing lists
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On Fri, 2012-06-01 at 11:39 +0100, Steven Whitehouse wrote:
> I've just been taking a look at the seq_read() code,
[]

nice improvement. trivial style comment:

> diff --git a/fs/seq_file.c b/fs/seq_file.c
[]
> @@ -169,6 +171,16 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
> */
> m->version = file->f_version;
>
> + if ((m->size < bsize) || !m->buf) {
> + kfree(m->buf);
> + m->size = 0;
> + m->buf = kmalloc(m->size = bsize, GFP_KERNEL|__GFP_NOWARN);

You can remove the m->size = 0 line and
can you please add a space around the |?
It's a bit dense and too easy to read it
as a single word.
> + if (!m->buf)
> + m->buf = kmalloc(m->size = PAGE_SIZE, GFP_KERNEL);
> + if (!m->buf)
> + goto Enomem;

Mixed case label?

> @@ -277,6 +289,11 @@ Done:
> m->read_pos += copied;
> }
> file->f_version = m->version;
> + if (m->size > PAGE_SIZE) {
> + kfree(m->buf);
> + m->buf = NULL;
> + m->size = 0;
> + }
> mutex_unlock(&m->lock);
> return copied;
> Enomem:

Oh, it wasn't you. nevermind...



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