One more request :-)
Actually "processor" keyword was not good in "physical processor ID"
(someone may be grepping it to find out the number of processors), and it
was one of the reasons it was changed/fixed in the AC tree.
Since (H/W) threads (rather than "siblings") in a CPU is generic (i.e. not
just an Intel thing), I would like to propose this ("physical id" is from
AC). Alan also simplified "number of simblings" to "siblings".
+#ifdef CONFIG_SMP
+ if (cpu_has_ht) {
+ seq_printf(m, "physical id\t: %d\n", phys_proc_id[n]);
+ seq_printf(m, "threads\t\t: %d\n", smp_num_siblings);
+ }
+#endif
Thanks,
Jun
-----Original Message-----
From: Robert Love [mailto:[email protected]]
Sent: Friday, October 25, 2002 12:21 PM
To: Dave Jones; [email protected]
Cc: [email protected]; Nakajima, Jun; [email protected];
Martin J. Bligh
Subject: Re: [PATCH] How to get number of physical CPU in linux from
user space?
On Fri, 2002-10-25 at 15:13, Dave Jones wrote:
> Should this be wrapped in a if (cpu_has_ht(c)) { } ?
> Seems silly to be displaying HT information on non-HT CPUs.
I am neutral, but is fine with me. It is just "cpu_has_ht", btw.
Take two...
This displays the physical processor id and number of siblings of each
processor in /proc/cpuinfo.
Robert Love
.proc.c.swp |binary
proc.c | 7 +++++++
2 files changed, 7 insertions(+)
diff -urN linux-2.5.44/arch/i386/kernel/cpu/proc.c
linux/arch/i386/kernel/cpu/proc.c
--- linux-2.5.44/arch/i386/kernel/cpu/proc.c 2002-10-19
00:02:29.000000000 -0400
+++ linux/arch/i386/kernel/cpu/proc.c 2002-10-25 15:18:03.000000000 -0400
@@ -17,6 +17,7 @@
* applications want to get the raw CPUID data, they should access
* /dev/cpu/<cpu_nr>/cpuid instead.
*/
+ extern int phys_proc_id[NR_CPUS];
static char *x86_cap_flags[] = {
/* Intel-defined */
"fpu", "vme", "de", "pse", "tsc", "msr", "pae", "mce",
@@ -74,6 +75,12 @@
/* Cache size */
if (c->x86_cache_size >= 0)
seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
+#ifdef CONFIG_SMP
+ if (cpu_has_ht) {
+ seq_printf(m, "physical processor ID\t: %d\n",
phys_proc_id[n]);
+ seq_printf(m, "number of siblings\t: %d\n",
smp_num_siblings);
+ }
+#endif
/* We use exception 16 if we have hardware math and we've either
seen it or the CPU claims it is internal */
fpu_exception = c->hard_math && (ignore_irq13 || cpu_has_fpu);