On Tue, 16 Feb 2010, KOSAKI Motohiro wrote:
> No current user? I don't think so.
>
> int bio_integrity_prep(struct bio *bio)
> {
> (snip)
> buf = kmalloc(len, GFP_NOIO | __GFP_NOFAIL | q->bounce_gfp);
>
> and
>
> void blk_queue_bounce_limit(struct request_queue *q, u64 dma_mask)
> {
> (snip)
> if (dma) {
> init_emergency_isa_pool();
> q->bounce_gfp = GFP_NOIO | GFP_DMA;
> q->limits.bounce_pfn = b_pfn;
> }
>
>
>
> I don't like rumor based discussion, I like fact based one.
>
The GFP_NOIO will prevent the oom killer from being called, it requires
__GFP_FS.
I can change this to invoke the should_alloc_retry() logic by testing for
!(gfp_mask & __GFP_NOFAIL), but there's nothing else the page allocator
can currently do to increase its probability of allocating pages; the
memory compaction patchset might be particularly helpful for these types
of scenarios.
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