Re: [PATCH 10/10] powerpc: remove address space overrides using set_fs()

[Christophe Leroy]

Le 03/09/2020 à 09:11, Christoph Hellwig a écrit :
> Except that we do not actually have such a patch.  For normal user
> writes we only use ->write_iter if ->write is not present.  But what
> shows up in the profile is that /dev/zero only has a read_iter op and
> not a normal read.  I've added a patch below that implements a normal
> read which might help a tad with this workload, but should not be part
> of a regression.

With that patch below, throughput is 113.5MB/s (instead of 99.9MB/s).
So a 14% improvement. That's not bad.

Christophe

> ---
> diff --git a/drivers/char/mem.c b/drivers/char/mem.c
> index abd4ffdc8cdebc..1dc99ab158457a 100644
> --- a/drivers/char/mem.c
> +++ b/drivers/char/mem.c
> @@ -726,6 +726,27 @@ static ssize_t read_iter_zero(struct kiocb *iocb, struct iov_iter *iter)
>   	return written;
>   }
>   
> +static ssize_t read_zero(struct file *file, char __user *buf,
> +			 size_t count, loff_t *ppos)
> +{
> +	size_t cleared = 0;
> +
> +	while (count) {
> +		size_t chunk = min_t(size_t, count, PAGE_SIZE);
> +
> +		if (clear_user(buf + cleared, chunk))
> +			return cleared ? cleared : -EFAULT;
> +		cleared += chunk;
> +		count -= chunk;
> +
> +		if (signal_pending(current))
> +			return cleared ? cleared : -ERESTARTSYS;
> +		cond_resched();
> +	}
> +
> +	return cleared;
> +}
> +
>   static int mmap_zero(struct file *file, struct vm_area_struct *vma)
>   {
>   #ifndef CONFIG_MMU
> @@ -921,6 +942,7 @@ static const struct file_operations zero_fops = {
>   	.llseek		= zero_lseek,
>   	.write		= write_zero,
>   	.read_iter	= read_iter_zero,
> +	.read		= read_zero,
>   	.write_iter	= write_iter_zero,
>   	.mmap		= mmap_zero,
>   	.get_unmapped_area = get_unmapped_area_zero,