lkml.org 
[lkml]   [2002]   [Oct]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
SubjectRe: [PATCH] How to get number of physical CPU in linux from user space?
From
Date
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);
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:30    [W:0.045 / U:0.600 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site