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Subject[PATCH 3/3] cpumask: use new cpuset_scnprintf function
Use cpuset_scnprintf to print cpumask sets where appropriate.  This is used
when the number of cpus present in a system is so large that the current
method of printing cpumask_t sets as mask bits result in a large number
of output lines. See Documentation/sysctl/kernel.txt(compat_cpuset_printf)
for usage info.

Also some small bugs fixed (or code efficiency improvments) for various uses
of cpuset_scnprintf.

[Depends on: x86: add cpuset_scnprintf function patch]

Based on:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
+ x86/latest .../x86/linux-2.6-x86.git
+ sched-devel/latest .../mingo/linux-2.6-sched-devel.git

Signed-off-by: Mike Travis <travis@sgi.com>
---
drivers/base/node.c | 5 +++--
drivers/base/topology.c | 14 +++++++++++---
drivers/pci/pci-sysfs.c | 7 ++++---
drivers/pci/probe.c | 6 +++---
kernel/cpuset.c | 4 ++--
kernel/irq/proc.c | 2 +-
kernel/profile.c | 2 +-
kernel/sched_stats.h | 12 +++++++++---
kernel/trace/trace.c | 2 +-
9 files changed, 35 insertions(+), 19 deletions(-)
--- linux-2.6.x86.orig/drivers/base/node.c
+++ linux-2.6.x86/drivers/base/node.c
@@ -28,8 +28,9 @@ static ssize_t node_read_cpumap(struct s
/* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);

- len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
- len += sprintf(buf + len, "\n");
+ len = cpuset_scnprintf(buf, PAGE_SIZE-2, mask);
+ buf[len++] = '\n';
+ buf[len] = '\0';
return len;
}

--- linux-2.6.x86.orig/drivers/base/topology.c
+++ linux-2.6.x86/drivers/base/topology.c
@@ -43,10 +43,18 @@ static ssize_t show_##name(struct sys_de
#define define_siblings_show_func(name) \
static ssize_t show_##name(struct sys_device *dev, char *buf) \
{ \
- ssize_t len = -1; \
+ unsigned long end = ALIGN((unsigned long)buf, PAGE_SIZE); \
+ int len = end - (unsigned long)buf; \
+ int n = 0; \
unsigned int cpu = dev->id; \
- len = cpumask_scnprintf(buf, NR_CPUS+1, topology_##name(cpu)); \
- return (len + sprintf(buf + len, "\n")); \
+ if (len == 0) \
+ len = PAGE_SIZE; \
+ if (len >= 2) { \
+ n = cpuset_scnprintf(buf, len-2, topology_##name(cpu)); \
+ buf[n++] = '\n'; \
+ buf[n] = '\0'; \
+ } \
+ return n; \
}

#ifdef topology_physical_package_id
--- linux-2.6.x86.orig/drivers/pci/pci-sysfs.c
+++ linux-2.6.x86/drivers/pci/pci-sysfs.c
@@ -72,9 +72,10 @@ static ssize_t local_cpus_show(struct de
int len;

mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
- len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
- strcat(buf,"\n");
- return 1+len;
+ len = cpuset_scnprintf(buf, PAGE_SIZE-2, mask);
+ buf[len++] = '\n';
+ buf[len] = '\0';
+ return len;
}

/* show resources */
--- linux-2.6.x86.orig/drivers/pci/probe.c
+++ linux-2.6.x86/drivers/pci/probe.c
@@ -89,9 +89,9 @@ static ssize_t pci_bus_show_cpuaffinity(
cpumask_t cpumask;

cpumask = pcibus_to_cpumask(to_pci_bus(dev));
- ret = cpumask_scnprintf(buf, PAGE_SIZE, cpumask);
- if (ret < PAGE_SIZE)
- buf[ret++] = '\n';
+ ret = cpuset_scnprintf(buf, PAGE_SIZE-2, cpumask);
+ buf[ret++] = '\n';
+ buf[ret] = '\0';
return ret;
}
DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpuaffinity, NULL);
--- linux-2.6.x86.orig/kernel/cpuset.c
+++ linux-2.6.x86/kernel/cpuset.c
@@ -2371,11 +2371,11 @@ const struct file_operations proc_cpuset
void cpuset_task_status_allowed(struct seq_file *m, struct task_struct *task)
{
seq_printf(m, "Cpus_allowed:\t");
- m->count += cpumask_scnprintf(m->buf + m->count, m->size - m->count,
+ m->count += cpuset_scnprintf(m->buf + m->count, m->size - m->count,
task->cpus_allowed);
seq_printf(m, "\n");
seq_printf(m, "Mems_allowed:\t");
- m->count += nodemask_scnprintf(m->buf + m->count, m->size - m->count,
+ m->count += nodeset_scnprintf(m->buf + m->count, m->size - m->count,
task->mems_allowed);
seq_printf(m, "\n");
}
--- linux-2.6.x86.orig/kernel/irq/proc.c
+++ linux-2.6.x86/kernel/irq/proc.c
@@ -27,7 +27,7 @@ static int irq_affinity_read_proc(char *
if (desc->status & IRQ_MOVE_PENDING)
mask = &desc->pending_mask;
#endif
- len = cpumask_scnprintf(page, count, *mask);
+ len = cpuset_scnprintf(page, count, *mask);

if (count - len < 2)
return -EINVAL;
--- linux-2.6.x86.orig/kernel/profile.c
+++ linux-2.6.x86/kernel/profile.c
@@ -426,7 +426,7 @@ void profile_tick(int type)
static int prof_cpu_mask_read_proc(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
- int len = cpumask_scnprintf(page, count, *(cpumask_t *)data);
+ int len = cpuset_scnprintf(page, count, *(cpumask_t *)data);
if (count - len < 2)
return -EINVAL;
len += sprintf(page + len, "\n");
--- linux-2.6.x86.orig/kernel/sched_stats.h
+++ linux-2.6.x86/kernel/sched_stats.h
@@ -4,11 +4,16 @@
* bump this up when changing the output format or the meaning of an existing
* format, so that tools can adapt (or abort)
*/
-#define SCHEDSTAT_VERSION 14
+#define SCHEDSTAT_VERSION 15

static int show_schedstat(struct seq_file *seq, void *v)
{
int cpu;
+ int mask_len = NR_CPUS/32 * 9;
+ char *mask_str = kmalloc(mask_len, GFP_KERNEL);
+
+ if (mask_str == NULL)
+ return -ENOMEM;

seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
seq_printf(seq, "timestamp %lu\n", jiffies);
@@ -36,9 +41,8 @@ static int show_schedstat(struct seq_fil
preempt_disable();
for_each_domain(cpu, sd) {
enum cpu_idle_type itype;
- char mask_str[NR_CPUS];

- cpumask_scnprintf(mask_str, NR_CPUS, sd->span);
+ cpuset_scnprintf(mask_str, mask_len, sd->span);
seq_printf(seq, "domain%d %s", dcount++, mask_str);
for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
itype++) {
@@ -63,6 +67,7 @@ static int show_schedstat(struct seq_fil
preempt_enable();
#endif
}
+ kfree(mask_str);
return 0;
}

@@ -75,6 +80,7 @@ static int schedstat_open(struct inode *

if (!buf)
return -ENOMEM;
+
res = single_open(file, show_schedstat, NULL);
if (!res) {
m = file->private_data;
--- linux-2.6.x86.orig/kernel/trace/trace.c
+++ linux-2.6.x86/kernel/trace/trace.c
@@ -1799,7 +1799,7 @@ tracing_cpumask_read(struct file *filp,

mutex_lock(&tracing_cpumask_update_lock);

- len = cpumask_scnprintf(mask_str, count, tracing_cpumask);
+ len = cpuset_scnprintf(mask_str, count, tracing_cpumask);
if (count - len < 2) {
count = -EINVAL;
goto out_err;
--


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