Messages in this thread Patch in this message | | | Subject | [PATCH] How to get number of physical CPU in linux from user space? | From | Robert Love <> | Date | 25 Oct 2002 15:09:09 -0400 |
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On Fri, 2002-10-25 at 14:54, Nakajima, Jun wrote:
> Recent distributions or the AC tree has additional fields in > /proc/cpu, which tell > - physical package id > - number of threads
Attached patch for 2.5 adds the same fields the 2.4-ac tree have. I consider those "standard" enough.
Is this something HT users want?
Robert Love
proc.c | 5 +++++ 1 files changed, 5 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 15:06:23.000000000 -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 +75,10 @@ /* Cache size */ if (c->x86_cache_size >= 0) seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size); +#ifdef CONFIG_SMP + 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/
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