proc: export statistics for softirq to /proc (d3d64df2) · Commits · e / devices / android_kernel_oneplus_sm8150

Documentation/filesystems/proc.txt

+26 −0

Original line number	Original line	Diff line number	Diff line
	@@ -283,6 +283,7 @@ Table 1-4: Kernel info in /proc
	rtc Real time clock		rtc Real time clock
	scsi SCSI info (see text)		scsi SCSI info (see text)
	slabinfo Slab pool info		slabinfo Slab pool info
			softirqs softirq usage
	stat Overall statistics		stat Overall statistics
	swaps Swap space utilization		swaps Swap space utilization
	sys See chapter 2		sys See chapter 2
	@@ -597,6 +598,25 @@ on the kind of area :
	0xffffffffa0017000-0xffffffffa0022000 45056 sys_init_module+0xc27/0x1d00 ...		0xffffffffa0017000-0xffffffffa0022000 45056 sys_init_module+0xc27/0x1d00 ...
	pages=10 vmalloc N0=10		pages=10 vmalloc N0=10

			..............................................................................

			softirqs:

			Provides counts of softirq handlers serviced since boot time, for each cpu.

			> cat /proc/softirqs
			CPU0 CPU1 CPU2 CPU3
			HI: 0 0 0 0
			TIMER: 27166 27120 27097 27034
			NET_TX: 0 0 0 17
			NET_RX: 42 0 0 39
			BLOCK: 0 0 107 1121
			TASKLET: 0 0 0 290
			SCHED: 27035 26983 26971 26746
			HRTIMER: 0 0 0 0
			RCU: 1678 1769 2178 2250


	1.3 IDE devices in /proc/ide		1.3 IDE devices in /proc/ide
	----------------------------		----------------------------

	@@ -883,6 +903,7 @@ since the system first booted. For a quick look, simply cat the file:
	processes 2915		processes 2915
	procs_running 1		procs_running 1
	procs_blocked 0		procs_blocked 0
			softirq 183433 0 21755 12 39 1137 231 21459 2263

	The very first "cpu" line aggregates the numbers in all of the other "cpuN"		The very first "cpu" line aggregates the numbers in all of the other "cpuN"
	lines. These numbers identify the amount of time the CPU has spent performing		lines. These numbers identify the amount of time the CPU has spent performing
	@@ -918,6 +939,11 @@ CPUs.
	The "procs_blocked" line gives the number of processes currently blocked,		The "procs_blocked" line gives the number of processes currently blocked,
	waiting for I/O to complete.		waiting for I/O to complete.

			The "softirq" line gives counts of softirqs serviced since boot time, for each
			of the possible system softirqs. The first column is the total of all
			softirqs serviced; each subsequent column is the total for that particular
			softirq.


	1.9 Ext4 file system parameters		1.9 Ext4 file system parameters
	------------------------------		------------------------------

fs/proc/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -18,6 +18,7 @@ proc-y += meminfo.o
	proc-y += stat.o		proc-y += stat.o
	proc-y += uptime.o		proc-y += uptime.o
	proc-y += version.o		proc-y += version.o
			proc-y += softirqs.o
	proc-$(CONFIG_PROC_SYSCTL) += proc_sysctl.o		proc-$(CONFIG_PROC_SYSCTL) += proc_sysctl.o
	proc-$(CONFIG_NET) += proc_net.o		proc-$(CONFIG_NET) += proc_net.o
	proc-$(CONFIG_PROC_KCORE) += kcore.o		proc-$(CONFIG_PROC_KCORE) += kcore.o

fs/proc/softirqs.c

0 → 100644

+44 −0

Original line number	Original line	Diff line number	Diff line
			#include <linux/init.h>
			#include <linux/kernel_stat.h>
			#include <linux/proc_fs.h>
			#include <linux/seq_file.h>

			/*
			* /proc/softirqs ... display the number of softirqs
			*/
			static int show_softirqs(struct seq_file p, void v)
			{
			int i, j;

			seq_printf(p, " ");
			for_each_possible_cpu(i)
			seq_printf(p, "CPU%-8d", i);
			seq_printf(p, "\n");

			for (i = 0; i < NR_SOFTIRQS; i++) {
			seq_printf(p, "%8s:", softirq_to_name[i]);
			for_each_possible_cpu(j)
			seq_printf(p, " %10u", kstat_softirqs_cpu(i, j));
			seq_printf(p, "\n");
			}
			return 0;
			}

			static int softirqs_open(struct inode inode, struct file file)
			{
			return single_open(file, show_softirqs, NULL);
			}

			static const struct file_operations proc_softirqs_operations = {
			.open = softirqs_open,
			.read = seq_read,
			.llseek = seq_lseek,
			.release = single_release,
			};

			static int __init proc_softirqs_init(void)
			{
			proc_create("softirqs", 0, NULL, &proc_softirqs_operations);
			return 0;
			}
			module_init(proc_softirqs_init);

fs/proc/stat.c

+15 −0

Original line number	Original line	Diff line number	Diff line
	@@ -29,6 +29,8 @@ static int show_stat(struct seq_file p, void v)
	cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;		cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
	cputime64_t guest;		cputime64_t guest;
	u64 sum = 0;		u64 sum = 0;
			u64 sum_softirq = 0;
			unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
	struct timespec boottime;		struct timespec boottime;
	unsigned int per_irq_sum;		unsigned int per_irq_sum;

	@@ -53,6 +55,13 @@ static int show_stat(struct seq_file p, void v)
	sum += kstat_irqs_cpu(j, i);		sum += kstat_irqs_cpu(j, i);
	}		}
	sum += arch_irq_stat_cpu(i);		sum += arch_irq_stat_cpu(i);

			for (j = 0; j < NR_SOFTIRQS; j++) {
			unsigned int softirq_stat = kstat_softirqs_cpu(j, i);

			per_softirq_sums[j] += softirq_stat;
			sum_softirq += softirq_stat;
			}
	}		}
	sum += arch_irq_stat();		sum += arch_irq_stat();

	@@ -115,6 +124,12 @@ static int show_stat(struct seq_file p, void v)
	nr_running(),		nr_running(),
	nr_iowait());		nr_iowait());

			seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);

			for (i = 0; i < NR_SOFTIRQS; i++)
			seq_printf(p, " %u", per_softirq_sums[i]);
			seq_printf(p, "\n");

	return 0;		return 0;
	}		}