c2fa09454e
The port of XFS to Linux introduced a thread-specific PF_FSTRANS bit that is used to mark contexts which are processing transactions. When set, allocations in this context can dip into kernel memory reserves to avoid deadlocks during writeback. Linux 3.9 provided the additional PF_MEMALLOC_NOIO for disabling __GFP_IO in page allocations, which XFS began using in 3.15. This patch implements hooks for marking transactions via PF_FSTRANS. When an allocation is performed in the context of PF_FSTRANS, any KM_SLEEP allocation is transparently converted to a GFP_NOIO allocation. Additionally, when using a Linux 3.9 or newer kernel, it will set PF_MEMALLOC_NOIO to prevent direct reclaim from entering pageout() on on any KM_PUSHPAGE or KM_NOSLEEP allocation. This effectively allows the spl_vmalloc() helper function to be used safely in a thread which is responsible for IO. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> |
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| rpm | ||
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| .gitignore | ||
| AUTHORS | ||
| COPYING | ||
| DISCLAIMER | ||
| META | ||
| Makefile.am | ||
| README.markdown | ||
| autogen.sh | ||
| configure.ac | ||
| copy-builtin | ||
| spl.release.in | ||
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