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proc: mark more files as permanent

Browse Source 
Mark
	/proc/devices
	/proc/kpagecount
	/proc/kpageflags
	/proc/kpagecgroup
	/proc/loadavg
	/proc/meminfo
	/proc/softirqs
	/proc/uptime
	/proc/version

as permanent /proc entries, saving alloc/free and some list/spinlock ops
per use.

These files are never removed by the kernel so it is OK to mark them.

Link: https://lkml.kernel.org/r/Yyn527DzDMa+r0Yj@localhost.localdomain
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2022-09-20 20:35:23 +03:00 committed by Andrew Morton
parent da6f79164e
commit ef1d61781b
8 changed files with 37 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/proc/devices.c
View File

@ -4,6 +4,7 @@
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/blkdev.h>
#include "internal.h"
static int devinfo_show(struct seq_file *f, void *v)
{
@ -54,7 +55,10 @@ static const struct seq_operations devinfo_ops = {
static int __init proc_devices_init(void)
{
proc_create_seq("devices", 0, NULL, &devinfo_ops);
struct proc_dir_entry *pde;
pde = proc_create_seq("devices", 0, NULL, &devinfo_ops);
pde_make_permanent(pde);
return 0;
}
fs_initcall(proc_devices_init);

5
fs/proc/internal.h
View File

@ -79,6 +79,11 @@ static inline bool pde_is_permanent(const struct proc_dir_entry *pde)
return pde->flags & PROC_ENTRY_PERMANENT;
}
static inline void pde_make_permanent(struct proc_dir_entry *pde)
{
pde->flags |= PROC_ENTRY_PERMANENT;
}
extern struct kmem_cache *proc_dir_entry_cache;
void pde_free(struct proc_dir_entry *pde);

6
fs/proc/loadavg.c
View File

@ -9,6 +9,7 @@
#include <linux/seq_file.h>
#include <linux/seqlock.h>
#include <linux/time.h>
#include "internal.h"
static int loadavg_proc_show(struct seq_file *m, void *v)
{
@ -27,7 +28,10 @@ static int loadavg_proc_show(struct seq_file *m, void *v)
static int __init proc_loadavg_init(void)
{
proc_create_single("loadavg", 0, NULL, loadavg_proc_show);
struct proc_dir_entry *pde;
pde = proc_create_single("loadavg", 0, NULL, loadavg_proc_show);
pde_make_permanent(pde);
return 0;
}
fs_initcall(proc_loadavg_init);

5
fs/proc/meminfo.c
View File

@ -162,7 +162,10 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
static int __init proc_meminfo_init(void)
{
proc_create_single("meminfo", 0, NULL, meminfo_proc_show);
struct proc_dir_entry *pde;
pde = proc_create_single("meminfo", 0, NULL, meminfo_proc_show);
pde_make_permanent(pde);
return 0;
}
fs_initcall(proc_meminfo_init);

3
fs/proc/page.c
View File

@ -91,6 +91,7 @@ static ssize_t kpagecount_read(struct file *file, char __user *buf,
}
static const struct proc_ops kpagecount_proc_ops = {
.proc_flags = PROC_ENTRY_PERMANENT,
.proc_lseek = mem_lseek,
.proc_read = kpagecount_read,
};
@ -268,6 +269,7 @@ static ssize_t kpageflags_read(struct file *file, char __user *buf,
}
static const struct proc_ops kpageflags_proc_ops = {
.proc_flags = PROC_ENTRY_PERMANENT,
.proc_lseek = mem_lseek,
.proc_read = kpageflags_read,
};
@ -322,6 +324,7 @@ static ssize_t kpagecgroup_read(struct file *file, char __user *buf,
}
static const struct proc_ops kpagecgroup_proc_ops = {
.proc_flags = PROC_ENTRY_PERMANENT,
.proc_lseek = mem_lseek,
.proc_read = kpagecgroup_read,
};

6
fs/proc/softirqs.c
View File

@ -3,6 +3,7 @@
#include <linux/kernel_stat.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include "internal.h"
/*
* /proc/softirqs ... display the number of softirqs
@ -27,7 +28,10 @@ static int show_softirqs(struct seq_file *p, void *v)
static int __init proc_softirqs_init(void)
{
proc_create_single("softirqs", 0, NULL, show_softirqs);
struct proc_dir_entry *pde;
pde = proc_create_single("softirqs", 0, NULL, show_softirqs);
pde_make_permanent(pde);
return 0;
}
fs_initcall(proc_softirqs_init);

6
fs/proc/uptime.c
View File

@ -7,6 +7,7 @@
#include <linux/time.h>
#include <linux/time_namespace.h>
#include <linux/kernel_stat.h>
#include "internal.h"
static int uptime_proc_show(struct seq_file *m, void *v)
{
@ -39,7 +40,10 @@ static int uptime_proc_show(struct seq_file *m, void *v)
static int __init proc_uptime_init(void)
{
proc_create_single("uptime", 0, NULL, uptime_proc_show);
struct proc_dir_entry *pde;
pde = proc_create_single("uptime", 0, NULL, uptime_proc_show);
pde_make_permanent(pde);
return 0;
}
fs_initcall(proc_uptime_init);

6
fs/proc/version.c
View File

@ -5,6 +5,7 @@
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/utsname.h>
#include "internal.h"
static int version_proc_show(struct seq_file *m, void *v)
{
@ -17,7 +18,10 @@ static int version_proc_show(struct seq_file *m, void *v)
static int __init proc_version_init(void)
{
proc_create_single("version", 0, NULL, version_proc_show);
struct proc_dir_entry *pde;
pde = proc_create_single("version", 0, NULL, version_proc_show);
pde_make_permanent(pde);
return 0;
}
fs_initcall(proc_version_init);