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maps4: make page monitoring /proc file optional

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Make /proc/ page monitoring configurable

This puts the following files under an embedded config option:

/proc/pid/clear_refs
/proc/pid/smaps
/proc/pid/pagemap
/proc/kpagecount
/proc/kpageflags

[akpm@linux-foundation.org: Kconfig fix]
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matt Mackall 2008-02-04 22:29:07 -08:00 committed by Linus Torvalds
parent 304daa8132
commit 1e88328111
5 changed files with 20 additions and 3 deletions
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4
fs/proc/base.c
View File

@ -2249,7 +2249,7 @@ static const struct pid_entry tgid_base_stuff[] = {
LNK("exe", exe),
REG("mounts", S_IRUGO, mounts),
REG("mountstats", S_IRUSR, mountstats),
#ifdef CONFIG_MMU
#ifdef CONFIG_PROC_PAGE_MONITOR
REG("clear_refs", S_IWUSR, clear_refs),
REG("smaps", S_IRUGO, smaps),
REG("pagemap", S_IRUSR, pagemap),
@ -2578,7 +2578,7 @@ static const struct pid_entry tid_base_stuff[] = {
LNK("root", root),
LNK("exe", exe),
REG("mounts", S_IRUGO, mounts),
#ifdef CONFIG_MMU
#ifdef CONFIG_PROC_PAGE_MONITOR
REG("clear_refs", S_IWUSR, clear_refs),
REG("smaps", S_IRUGO, smaps),
REG("pagemap", S_IRUSR, pagemap),

4
fs/proc/proc_misc.c
View File

@ -676,6 +676,7 @@ static const struct file_operations proc_sysrq_trigger_operations = {
};
#endif
#ifdef CONFIG_PROC_PAGE_MONITOR
#define KPMSIZE sizeof(u64)
#define KPMMASK (KPMSIZE - 1)
/* /proc/kpagecount - an array exposing page counts
@ -804,6 +805,7 @@ static struct file_operations proc_kpageflags_operations = {
.llseek = mem_lseek,
.read = kpageflags_read,
};
#endif /* CONFIG_PROC_PAGE_MONITOR */
struct proc_dir_entry *proc_root_kcore;
@ -885,8 +887,10 @@ void __init proc_misc_init(void)
(size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
}
#endif
#ifdef CONFIG_PROC_PAGE_MONITOR
create_seq_entry("kpagecount", S_IRUSR, &proc_kpagecount_operations);
create_seq_entry("kpageflags", S_IRUSR, &proc_kpageflags_operations);
#endif
#ifdef CONFIG_PROC_VMCORE
proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
if (proc_vmcore)

2
fs/proc/task_mmu.c
View File

@ -337,6 +337,7 @@ const struct file_operations proc_maps_operations = {
*/
#define PSS_SHIFT 12
#ifdef CONFIG_PROC_PAGE_MONITOR
struct mem_size_stats
{
struct vm_area_struct *vma;
@ -717,6 +718,7 @@ const struct file_operations proc_pagemap_operations = {
.llseek = mem_lseek, /* borrow this */
.read = pagemap_read,
};
#endif /* CONFIG_PROC_PAGE_MONITOR */
#ifdef CONFIG_NUMA
extern int show_numa_map(struct seq_file *m, void *v);

10
init/Kconfig
View File

@ -678,6 +678,16 @@ config MARKERS
source "arch/Kconfig"
config PROC_PAGE_MONITOR
default y
depends on PROC_FS && MMU
bool "Enable /proc page monitoring" if EMBEDDED
help
Various /proc files exist to monitor process memory utilization:
/proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
/proc/kpagecount, and /proc/kpageflags. Disabling these
interfaces will reduce the size of the kernel by approximately 4kb.
endmenu # General setup
config SLABINFO

3
mm/Makefile
View File

@ -5,7 +5,7 @@
mmu-y := nommu.o
mmu-$(CONFIG_MMU) := fremap.o highmem.o madvise.o memory.o mincore.o \
mlock.o mmap.o mprotect.o mremap.o msync.o rmap.o \
vmalloc.o pagewalk.o
vmalloc.o
obj-y := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
page_alloc.o page-writeback.o pdflush.o \
@ -13,6 +13,7 @@ obj-y := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
prio_tree.o util.o mmzone.o vmstat.o backing-dev.o \
page_isolation.o $(mmu-y)
obj-$(CONFIG_PROC_PAGE_MONITOR) += pagewalk.o
obj-$(CONFIG_BOUNCE) += bounce.o
obj-$(CONFIG_SWAP) += page_io.o swap_state.o swapfile.o thrash.o
obj-$(CONFIG_HUGETLBFS) += hugetlb.o