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| author | Mike Travis <travis@sgi.com> | 2011-05-24 17:13:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 08:39:45 -0700 |
| commit | 4b060420a596095869a6d7849caa798d23839cd1 (patch) | |
| tree | ebbbc25555d0358f73527f114f78691ac849ce3e /include/linux/cpumask.h | |
| parent | e50c1f609c63223adaa38f5a79b18759a00adf72 (diff) | |
| download | kernel_goldelico_gta04-4b060420a596095869a6d7849caa798d23839cd1.zip kernel_goldelico_gta04-4b060420a596095869a6d7849caa798d23839cd1.tar.gz kernel_goldelico_gta04-4b060420a596095869a6d7849caa798d23839cd1.tar.bz2 | |
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.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index bae6fe2..b24ac56 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 |