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authorHeiko Carstens <heiko.carstens@de.ibm.com>2012-08-23 16:31:13 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-09-26 15:44:51 +0200
commit881730ad365130f64b5c70c40904b04eb3b79de3 (patch)
tree53fe5c94f2497475967a516cb9c148bcf6d21adb /arch/s390/kernel/Makefile
parent648609e3f24599a5ad8d53df2ec13fbc37810bcc (diff)
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s390/cache: expose cpu cache topology via sysfs
Expose cpu cache topology via sysfs. The created sysfs directory structure is compatible to what x86, ia64 and powerpc have. On s390 we expose only information about cpu caches which are private to a cpu via sysfs . Caches which are shared between cpus do not have a sysfs representation. The reason for that is that the file "shared_cpu_map" is mandatory and only if running under LPAR it is possible to tell which cpus share which cache. Second level hypervisors however do not and cannot expose that information to guests. In order to have a consistent view we made the choice to always only expose information about private cpu caches via sysfs. Example for a z196 cpu (cpu1 in /sys/devices/cpu): cpu1/cache/index0/size -- 64K cpu1/cache/index0/type -- Data cpu1/cache/index0/level -- 1 cpu1/cache/index0/number_of_sets -- 64 cpu1/cache/index0/shared_cpu_map -- 00000000,00000002 cpu1/cache/index0/shared_cpu_list -- 1 cpu1/cache/index0/coherency_line_size -- 256 cpu1/cache/index0/ways_of_associativity -- 4 cpu1/cache/index1/size -- 128K cpu1/cache/index1/type -- Instruction cpu1/cache/index1/level -- 1 cpu1/cache/index1/number_of_sets -- 64 cpu1/cache/index1/shared_cpu_map -- 00000000,00000002 cpu1/cache/index1/shared_cpu_list -- 1 cpu1/cache/index1/coherency_line_size -- 256 cpu1/cache/index1/ways_of_associativity -- 8 cpu1/cache/index2/size -- 1536K cpu1/cache/index2/type -- Unified cpu1/cache/index2/level -- 2 cpu1/cache/index2/number_of_sets -- 512 cpu1/cache/index2/shared_cpu_map -- 00000000,00000002 cpu1/cache/index2/shared_cpu_list -- 1 cpu1/cache/index2/coherency_line_size -- 256 cpu1/cache/index2/ways_of_associativity -- 12 Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/Makefile')
-rw-r--r--arch/s390/kernel/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 9733b3f0eb6d..86b8247134c1 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -49,6 +49,7 @@ obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf.o
+obj-$(CONFIG_64BIT) += cache.o
# Kexec part
S390_KEXEC_OBJS := machine_kexec.o crash.o
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