Messages in this thread | | | Date | Tue, 17 Dec 2002 12:17:44 -0800 | From | Ulrich Drepper <> | Subject | Re: Intel P6 vs P7 system call performance |
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Linus Torvalds wrote:
> ===== arch/i386/kernel/sysenter.c 1.1 vs edited ===== > --- 1.1/arch/i386/kernel/sysenter.c Mon Dec 16 21:39:04 2002 > +++ edited/arch/i386/kernel/sysenter.c Tue Dec 17 11:39:39 2002 > @@ -48,14 +48,14 @@ > 0xc3 /* ret */ > }; > static const char sysent[] = { > - 0x55, /* push %ebp */ > 0x51, /* push %ecx */ > 0x52, /* push %edx */ > + 0x55, /* push %ebp */ > 0x89, 0xe5, /* movl %esp,%ebp */ > 0x0f, 0x34, /* sysenter */ > + 0x5d, /* pop %ebp */ > 0x5a, /* pop %edx */ > 0x59, /* pop %ecx */ > - 0x5d, /* pop %ebp */ > 0xc3 /* ret */
Instead of duplicating the push/pop %ebp just use the first one by using
movl 12(%ebo), %ebp
in the kernel code or remove the first. The later is better, smaller code.
-- --------------. ,-. 444 Castro Street Ulrich Drepper \ ,-----------------' \ Mountain View, CA 94041 USA Red Hat `--' drepper at redhat.com `---------------------------
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