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authorMike Travis <travis@sgi.com>2011-05-24 17:13:12 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-25 08:39:45 -0700
commit4b060420a596095869a6d7849caa798d23839cd1 (patch)
treeebbbc25555d0358f73527f114f78691ac849ce3e /include/linux/cpumask.h
parente50c1f609c63223adaa38f5a79b18759a00adf72 (diff)
bitmap, irq: add smp_affinity_list interface to /proc/irq
Manually adjusting the smp_affinity for IRQ's becomes unwieldy when the cpu count is large. Setting smp affinity to cpus 256 to 263 would be: echo 000000ff,00000000,00000000,00000000,00000000,00000000,00000000,00000000 > smp_affinity instead of: echo 256-263 > smp_affinity_list Think about what it looks like for cpus around say, 4088 to 4095. We already have many alternate "list" interfaces: /sys/devices/system/cpu/cpuX/indexY/shared_cpu_list /sys/devices/system/cpu/cpuX/topology/thread_siblings_list /sys/devices/system/cpu/cpuX/topology/core_siblings_list /sys/devices/system/node/nodeX/cpulist /sys/devices/pci***/***/local_cpulist Add a companion interface, smp_affinity_list to use cpu lists instead of cpu maps. This conforms to other companion interfaces where both a map and a list interface exists. This required adding a bitmap_parselist_user() function in a manner similar to the bitmap_parse_user() function. [akpm@linux-foundation.org: make __bitmap_parselist() static] Signed-off-by: Mike Travis <travis@sgi.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jack Steiner <steiner@sgi.com> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/cpumask.h')
-rw-r--r--include/linux/cpumask.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index bae6fe24d1f..b24ac56477b 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -547,6 +547,21 @@ static inline int cpumask_parse_user(const char __user *buf, int len,
}
/**
+ * cpumask_parselist_user - extract a cpumask from a user string
+ * @buf: the buffer to extract from
+ * @len: the length of the buffer
+ * @dstp: the cpumask to set.
+ *
+ * Returns -errno, or 0 for success.
+ */
+static inline int cpumask_parselist_user(const char __user *buf, int len,
+ struct cpumask *dstp)
+{
+ return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
+ nr_cpumask_bits);
+}
+
+/**
* cpulist_scnprintf - print a cpumask into a string as comma-separated list
* @buf: the buffer to sprintf into
* @len: the length of the buffer