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Brian Behlendorf
ed3163484d
In the initial implementation emergency objects were tracked on a per-cache list. The assumption was that under normal operation we would never allocate more than a handful of these objects. So the cost of walking the list during free was expected to be negligible. However real world usage has shown that emergency objects tend to be allocated in batches. A deadlock will be detected and several thousand emergency objects will be allocated before the original blocked slab allocation can complete. Therefore the original list has been replaced by a red black tree which is sorted by the memory address of each allocated object. This bounds the worst case insertion and removal time to O(log n) which minimize contention on the assoicated spin lock. 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
To copy the kernel code inside your kernel source tree for builtin compilation:
$ ./configure --enable-linux-builtin --with-linux=/usr/src/linux-...
$ ./copy-builtin /usr/src/linux-...
Full documentation for building, configuring, and using the SPL can be found at: http://zfsonlinux.org