[CRIU] [PATCH 0/8] Some optimization and cleanup to sigaction management by criu

[Pavel Emelyanov]

I've noticed, that we spend 64 sys_rt_sigaction syscalls for each
task on restore. Not big deal, but this takes noticeable amount of
time for big trees. While fixing it I've also tuned some places
where criu manages its own signals.

Thanks,
Pavel