On Fri, Mar 08, 2019 at 01:37:26PM +0800, wuzhouhui wrote: > Hi, > > I check kernel code and found that GFP_ATOMIC allocation will > use emergency pool and maybe failed if emergency pool is not > enough. And GFP_ATOMIC doesn't trigger reclaim (because of > ATOMIC) even if there are a lot of page caches. So my question > is how to avoid or reduce GFP_ATOMIC allocation failed if there > are enough reclaimable memory? Is there some kernel parameters > can be configured? Have you seen the ATOMIC pools be used up and not able to be reclaimed in real-world usages? If so, I'm sure the mm developers would love to hear from you about this as I really do not think that is a situation that can happen easily, if at all. And no, I do not think there are any such parameters, the kernel should be self-tuning for things like this. thanks, greg k-h _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
