Re: [PATCH 05/18] Add io_uring IO interface

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Mon, Jan 28, 2019 at 09:26:42AM -0700, Jens Axboe wrote:
> >> +static void io_free_scq_urings(struct io_ring_ctx *ctx)
> >> +{
> >> +	if (ctx->sq_ring) {
> >> +		page_frag_free(ctx->sq_ring);
> >> +		ctx->sq_ring = NULL;
> >> +	}
> >> +	if (ctx->sq_sqes) {
> >> +		page_frag_free(ctx->sq_sqes);
> >> +		ctx->sq_sqes = NULL;
> >> +	}
> >> +	if (ctx->cq_ring) {
> >> +		page_frag_free(ctx->cq_ring);
> >> +		ctx->cq_ring = NULL;
> >> +	}
> > 
> > Why is this using the page_frag helpers?  Also the callers just free
> > these ctx structure, so there isn't much of a point zeroing them out.
> 
> Why not use the page frag helpers? No point in open-coding it. I can
> kill the zeroing, double call would be a bug anyway.

Because they are at a different level of abstraction, and someone
might change the implementation, and is unlikely to catch the io_uring
mix of interfaces.  If you think this is really useful we should also
export the helpers under a different name and with documentation.
(and add a __get_free_pages version that returns a pointer..)



[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]

  Powered by Linux