diff options
author | Jeremy Kerr <jk@ozlabs.org> | 2007-09-19 04:38:12 (GMT) |
---|---|---|
committer | Paul Mackerras <paulus@samba.org> | 2007-09-19 05:12:16 (GMT) |
commit | 98f06978ffebbec16abdea58489f217229580859 (patch) | |
tree | 4c0cad43f6bc59083e00a20c423864ac579cdf32 /arch/powerpc/platforms/cell/spufs/spufs.h | |
parent | 36ddbb1380f282b4280c57efdb646dd8647a789f (diff) | |
download | linux-fsl-qoriq-98f06978ffebbec16abdea58489f217229580859.tar.xz |
[POWERPC] cell: Unify spufs syscall path
At present, a built-in spufs will not use the spufs_calls callbacks, but
directly call sys_spu_create. This saves us an indirect branch, but
means we have duplicated functions - one for CONFIG_SPU_FS=y and one for
=m.
This change unifies the spufs syscall path, and provides access to the
spufs_calls structure through a get/put pair. At present, the only user
of the spufs_calls structure is spu_syscalls.c, but this will facilitate
adding the coredump calls later.
Everyone likes numbers, right? Here's a before/after comparison with
CONFIG_SPU_FS=y, doing spu_create(); close(); 64k times.
Before:
[jk@cell ~]$ time ./spu_create
performing 65536 spu_create calls
real 0m24.075s
user 0m0.146s
sys 0m23.925s
After:
[jk@cell ~]$ time ./spu_create
performing 65536 spu_create calls
real 0m24.777s
user 0m0.141s
sys 0m24.631s
So, we're adding around 11us per syscall, at the benefit of having
only one syscall path.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms/cell/spufs/spufs.h')
-rw-r--r-- | arch/powerpc/platforms/cell/spufs/spufs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/spufs.h b/arch/powerpc/platforms/cell/spufs/spufs.h index 2bfdeb8..3dbffeb 100644 --- a/arch/powerpc/platforms/cell/spufs/spufs.h +++ b/arch/powerpc/platforms/cell/spufs/spufs.h @@ -200,6 +200,7 @@ extern struct tree_descr spufs_dir_contents[]; extern struct tree_descr spufs_dir_nosched_contents[]; /* system call implementation */ +extern struct spufs_calls spufs_calls; long spufs_run_spu(struct spu_context *ctx, u32 *npc, u32 *status); long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode, struct file *filp); |