Messages in this thread | | | From | Jeff Moyer <> | Subject | Re: [patch] bdi: add a user-tunable cpu_list for the bdi flusher threads | Date | Mon, 03 Dec 2012 11:22:31 -0500 |
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Jeff Moyer <jmoyer@redhat.com> writes:
>>> + bdi->flusher_cpumask = kmalloc(sizeof(cpumask_t), GFP_KERNEL); >>> + if (!bdi->flusher_cpumask) >>> + return -ENOMEM; >> >> The bare GFP_KERNEL raises an eyebrow. Some bdi_init() callers like >> blk_alloc_queue_node() look like they'll want to pass in a gfp_t for the >> allocation. > > I'd be surprised if that was necessary, seeing how every single caller > of blk_alloc_queue_node passes in GFP_KERNEL. I'll make the change, > though, there aren't too many callers of bdi_init out there.
No other callers of bdi_init want anything but GFP_KERNEL. In the case of blk_alloc_queue_node, even *it* doesn't honor the gfp_t passed in! Have a look at blkcg_init_queue (called from blk_alloc_queue_node) to see what I mean. Maybe that's a bug?
I've written the patch to modify bdi_init to take a gfp_t, but I'm actually not in favor of this change, so I'm not going to post it (unless, of course, you can provide a compelling argument). :-)
Cheers, Jeff
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