On 07.10.2015 08:14, Konstantin Belousov wrote: > I believe there are subtle differences between our- and Linux- nowait > behaviour. I claim (but do not want to take liability of prove it with > references to Linux code) that our M_NOWAIT may fail transiently due to > pagedaemon not keeping up with load, while Linux top-half nowait alloc > only fails for real out-of-resources conditions. > > What I am trying to say, leave M_NOWAIT out of syscalls. Some time ago > M_NOWAIT also means that the caller is allowed to use reserves to satisfy > allocation, but this was fixed.
Ok, I understand. Let's revert to use M_WAITOK then. During the DRM core update, I also used M_NOWAIT. Likewise for the i915 WIP. I will change some of them back to M_WAITOK after checking the context of the allocation (syscall or not). Thank you for the clarification on those flags! -- Jean-Sébastien Pédron
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