4be55565fe
Unless __GFP_IO and __GFP_FS are removed from the file mapping gfp mask we may enter memory reclaim during IO. In this case shrink_slab() entered another file system which is notoriously hungry for stack. This additional stack usage may cause a stack overflow. This patch removes __GFP_IO and __GFP_FS from the mapping gfp mask of each file during vn_open() to avoid any reclaim in the vn_rdwr() IO path. The original mask is then restored at vn_close() time. Hats off to the loop driver which does something similiar for the same reason. [...] shrink_slab+0xdc/0x153 try_to_free_pages+0x1da/0x2d7 __alloc_pages+0x1d7/0x2da do_generic_mapping_read+0x2c9/0x36f file_read_actor+0x0/0x145 __generic_file_aio_read+0x14f/0x19b generic_file_aio_read+0x34/0x39 do_sync_read+0xc7/0x104 vfs_read+0xcb/0x171 :spl:vn_rdwr+0x2b8/0x402 :zfs:vdev_file_io_start+0xad/0xe1 [...] Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> |
||
|---|---|---|
| cmd | ||
| config | ||
| include | ||
| lib | ||
| module | ||
| patches | ||
| scripts | ||
| .gitignore | ||
| AUTHORS | ||
| COPYING | ||
| ChangeLog | ||
| DISCLAIMER | ||
| INSTALL | ||
| META | ||
| Makefile.am | ||
| Makefile.in | ||
| README.markdown | ||
| autogen.sh | ||
| configure | ||
| configure.ac | ||
| spl-modules.spec.in | ||
| spl.spec.in | ||
| spl_config.h.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 don’t want the overhead of maintaining a large patch which converts Solaris primitives to Linux primitives.
Documentation for building, configuring, and using the SPL can be found at: http://wiki.github.com/behlendorf/spl/