On 06/14/2012 11:21 AM, Tejun Heo wrote: > Hello, guys. > > On Thu, Jun 14, 2012 at 11:07:53AM +0900, Minchan Kim wrote: >> It shouldn't work because vmap_page_range still can allocate >> GFP_KERNEL by pud_alloc in vmap_pud_range. For it, I tried [1] but >> other mm guys want to add WARNING [2] so let's avoiding gfp context >> passing. >> >> [1] https://lkml.org/lkml/2012/4/23/77 >> [2] https://lkml.org/lkml/2012/5/2/340 > > Yeah, vmalloc area doesn't support !GFP_KERNEL allocations and as > Minchan said, changing this would require updating page table > allocation functions on all archs. This is the same reason why percpu > allocator doesn't support !GFP_KERNEL allocations which in turn made > blk-throttle implement its own private percpu pool. > > If xfs can't live without GFP_NOFS vmalloc allocations, either it has > to implement its own pool or maybe it's time to implement !GFP_KERNEL > allocs for vmalloc area. I don't know. There is another example in ARM. http://www.spinics.net/lists/arm-kernel/msg179202.html They try to make pool for atomic vmalloc support. :( Only GFP_KERNEL support vmalloc spreads out many pools in system, Sigh. -- Kind regards, Minchan Kim _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
