On 03/16/2014 08:43 PM, H. Peter Anvin wrote: > On 03/16/2014 08:35 PM, Sarah Newman wrote: >> Can you please review my patch first? It's only enabled when absolutely >> required. > > It doesn't help. It means you're running on Xen, and you will have > processes subjected to random SIGKILL because they happen to touch the > FPU when the atomic pool is low. > > However, there is probably a happy medium: you don't actually need eager > FPU restore, you just need eager FPU *allocation*. We have been > intending to allocate the FPU state at task creation time for eagerfpu, > and Suresh Siddha has already produced such a patch; it just needs some > minor fixups due to an __init failure. > > http://lkml.kernel.org/r/1391325599.6481.5.camel@europa > > In the Xen case we could turn on eager allocation but not eager fpu. In > fact, it might be justified to *always* do eager allocation...
Unconditional eager allocation works. Can xen users count on this being included and applied to the stable kernels? Thanks, Sarah -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
