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Neependra Khare
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The cv_timedwait() function by definition must wait unconditionally for cv_signal()/cv_broadcast() before waking. This causes processes to go in the D state which increases the load average. The load average is the summation of processes in D state and run queue. To avoid this it can be desirable to sleep interruptibly. These processes do not count against the load average but may be woken by a signal. It is up to the caller to determine why the process was woken it may be for one of three reasons. 1) cv_signal()/cv_broadcast() 2) the timeout expired 3) a signal was received Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
The Solaris Porting Layer (SPL) is a Linux kernel module which provides many of the Solaris kernel APIs. This shim layer makes it possible to run Solaris kernel code in the Linux kernel with relatively minimal modification. This can be particularly useful when you want to track upstream Solaris development closely and don’t want the overhead of maintaining a large patch which converts Solaris primitives to Linux primitives.
To build packages for your distribution:
$ ./configure
$ make pkg
Full documentation for building, configuring, and using the SPL can be found at: http://zfsonlinux.org