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[MIPS] Add debugfs files to show fpuemu statistics 

Export contents of struct mips_fpu_emulator_stats via debugfs.

There is no way to read these statistics for now but they (at least
the "emulated" count) might be sometimes useful for performance tuning
on FPU-less CPUs.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto 2007-07-07 23:21:49 +09:00 committed by Ralf Baechle
parent 6312e0ee45
commit 83fd38cabc
1 changed files with 34 additions and 0 deletions
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34
arch/mips/math-emu/cp1emu.c
View File

@ -35,6 +35,7 @@
* better performance by compiling with -msoft-float! * better performance by compiling with -msoft-float!
*/ */
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/debugfs.h>
#include <asm/inst.h> #include <asm/inst.h>
#include <asm/bootinfo.h> #include <asm/bootinfo.h>
@ -1277,3 +1278,36 @@ int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
return sig; return sig;
} }
#ifdef CONFIG_DEBUG_FS
extern struct dentry *mips_debugfs_dir;
static int __init debugfs_fpuemu(void)
{
struct dentry *d, *dir;
int i;
static struct {
const char *name;
unsigned int *v;
} vars[] __initdata = {
{ "emulated", &fpuemustats.emulated },
{ "loads", &fpuemustats.loads },
{ "stores", &fpuemustats.stores },
{ "cp1ops", &fpuemustats.cp1ops },
{ "cp1xops", &fpuemustats.cp1xops },
{ "errors", &fpuemustats.errors },
};
if (!mips_debugfs_dir)
return -ENODEV;
dir = debugfs_create_dir("fpuemustats", mips_debugfs_dir);
if (IS_ERR(dir))
return PTR_ERR(dir);
for (i = 0; i < ARRAY_SIZE(vars); i++) {
d = debugfs_create_u32(vars[i].name, S_IRUGO, dir, vars[i].v);
if (IS_ERR(d))
return PTR_ERR(d);
}
return 0;
}
__initcall(debugfs_fpuemu);
#endif