[PATCH] Add cache info to /proc/cpuinfo

[PATCH] Add cache info to /proc/cpuinfo

[Peter Watkins]

[-- Attachment #1: Type: text/plain, Size: 701 bytes --]

This patch shows you more details about the cache using /proc/cpuinfo.
It also shows the TLB page size.

For example:

system type             : MIPS Malta
processor               : 0
cpu model               : MIPS 20Kc V2.0  FPU V2.0
BogoMIPS                : 478.20
wait instruction        : no
microsecond timers      : yes
tlb_entries             : 48 64K pages
icache size             : 32K sets 256 ways 4 linesize 32
dcache size             : 32K sets 256 ways 4 linesize 32
default cache policy    : cached write-back
extra interrupt vector  : yes
hardware watchpoint     : yes
ASEs implemented        : mips3d
VCED exceptions         : not available
VCEI exceptions         : not available



[-- Attachment #2: 0001-Add-cache-info-to-cpuinfo-display.txt --]
[-- Type: text/plain, Size: 2460 bytes --]

Date: Thu, 14 Sep 2006 11:24:51 -0400
Subject: [PATCH] Add cache info to cpuinfo display.
---
 arch/mips/kernel/proc.c |   34 +++++++++++++++++++++++++++++++++-
 1 files changed, 33 insertions(+), 1 deletions(-)

diff --git a/arch/mips/kernel/proc.c b/arch/mips/kernel/proc.c
index d8beef1..54f4da3 100644
--- a/arch/mips/kernel/proc.c
+++ b/arch/mips/kernel/proc.c
@@ -92,6 +92,7 @@ static int show_cpuinfo(struct seq_file 
 	unsigned int version = current_cpu_data.processor_id;
 	unsigned int fp_vers = current_cpu_data.fpu_id;
 	unsigned long n = (unsigned long) v - 1;
+	unsigned long cache_size;
 	char fmt [64];
 
 #ifdef CONFIG_SMP
@@ -118,7 +119,38 @@ #endif
 	seq_printf(m, "wait instruction\t: %s\n", cpu_wait ? "yes" : "no");
 	seq_printf(m, "microsecond timers\t: %s\n",
 	              cpu_has_counter ? "yes" : "no");
-	seq_printf(m, "tlb_entries\t\t: %d\n", current_cpu_data.tlbsize);
+	seq_printf(m, "tlb_entries\t\t: %d %luK pages\n", current_cpu_data.tlbsize,
+			PAGE_SIZE/1024);
+	cache_size = current_cpu_data.icache.sets * 
+		     current_cpu_data.icache.ways *
+		     current_cpu_data.icache.linesz;
+	if (cache_size) {
+	    seq_printf(m, "icache size\t\t: %luK sets %d ways %d linesize %d\n",
+	              cache_size/1024, current_cpu_data.icache.sets,
+		      current_cpu_data.icache.ways, current_cpu_data.icache.linesz);
+	}
+	cache_size = current_cpu_data.dcache.sets * 
+		     current_cpu_data.dcache.ways *
+		     current_cpu_data.dcache.linesz;
+	if (cache_size) {
+	    seq_printf(m, "dcache size\t\t: %luK sets %d ways %d linesize %d\n",
+	              cache_size/1024, current_cpu_data.dcache.sets,
+		      current_cpu_data.dcache.ways, current_cpu_data.dcache.linesz);
+	}
+	cache_size = current_cpu_data.scache.sets * 
+		     current_cpu_data.scache.ways *
+		     current_cpu_data.scache.linesz;
+	if (cache_size) {
+	    seq_printf(m, "scache size\t\t: %luK sets %d ways %d linesize %d\n",
+	              cache_size/1024, current_cpu_data.scache.sets,
+		      current_cpu_data.scache.ways, current_cpu_data.scache.linesz);
+	}
+	/* In pgtable-bits.h we never use a write-through policy */
+#ifdef CONFIG_MIPS_UNCACHED
+	seq_printf(m, "default cache policy\t: uncached\n");
+#else
+	seq_printf(m, "default cache policy\t: cached write-back\n");
+#endif
 	seq_printf(m, "extra interrupt vector\t: %s\n",
 	              cpu_has_divec ? "yes" : "no");
 	seq_printf(m, "hardware watchpoint\t: %s\n",
-- 
1.4.1

Re: [PATCH] Add cache info to /proc/cpuinfo

[Atsushi Nemoto]

On Thu, 14 Sep 2006 11:51:37 -0400, Peter Watkins <treestem@gmail.com> wrote:
> This patch shows you more details about the cache using /proc/cpuinfo.
> It also shows the TLB page size.

Unfortunately this patch will not work for users of c-r3k.c and
c-sb1.c.  These does not fill correct values to cpu_data for now.

Also, current_cpu_data should not be used in show_cpuinfo.  You can
use cpu_data[n] instead.

# I know now show_cpuinfo _is_ using current_cpu_data in some place.
# These should be fixed.  A patch have been sent to Ralf already.

---
Atsushi Nemoto