Re: [PATCH] 2.6 workaround for Athlon/Opteron prefetch errata

[dada1]

From: "Andi Kleen" <ak@xxxxxx>
>
> Of course they may want to also fix it in a different way to run on older
> kernels (e.g. handling the signal in user space or avoiding the
conditions).
> But doing it centrally in the kernel is a bit cleaner and at some point
> people have to update their kernels anyways.

Could you be kind enough to post here the example code for a SIGSEGV handler
that would be necessary for old kernels ?

I do think it woul help some people like me, for the future googling on the
prefetch errata.

I do use preftechnta instructions on my programs, and this errata could
explain some strange crashes.

As the program crashing is a huge multi-threaded network application, with
up to 300000 opened TCP sockets, the SIGSEGV fault is usually followed by a
system crash (networks buffers using all of lowmem)

Thanks
Eric Dumazet

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