5f920fbee1
To minimize the size of a kmutex_t a MUTEX_OWNER check was added. It allowed the kmutex_t wrapper to leverage the mutex owner which was already stored in the mutex for certain kernel configurations. The upside to this was that it reduced the size of the kmutex_t wrapper structure by the size of a task_struct pointer (4/8 bytes). The downside was that two mutex implementations needed to be maintained. Depending on your exact kernel configuration the correct one would be selected. Over the years this solution worked but it could be fragile since it depending heavily on assumed kernel mutex implementation details. For example the SPL_AC_MUTEX_OWNER_TASK_STRUCT configure check needed to be added when the kernel changed how the owner was stored. It also made the code more complicated than it needed to be. Therefore, in the name of simplicity and portability this optimization is being retired. It will slightly increase the memory requirements for a kmutex_t but only very slightly. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Issue #435 |
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README.markdown
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 do not want the overhead of maintaining a large patch which converts Solaris primitives to Linux primitives.
To build packages for your distribution:
$ ./configure
$ make pkg
If you are building directly from the git tree and not an officially released tarball you will need to generate the configure script. This can be done by executing the autogen.sh script after installing the GNU autotools for your distribution.
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-...
The SPL comes with an automated test suite called SPLAT. The test suite is implemented in two parts. There is a kernel module which contains the tests and a user space utility which controls which tests are run. To run the full test suite:
$ sudo insmod ./module/splat/splat.ko
$ sudo ./cmd/splat --all
Full documentation for building, configuring, testing, and using the SPL can be found at: http://zfsonlinux.org