maps4: make page monitoring /proc file optional

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 [[email protected]: Kconfig fix] Signed-off-by: Matt Mackall <[email protected]> Cc: Dave Hansen <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
cluon · Feb 5, 2008 · 1e88328 · 1e88328
1 parent 304daa8
commit 1e88328
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Showing 5 changed files with 20 additions and 3 deletions.
diff --git a/fs/proc/base.c b/fs/proc/base.c
@@ -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),

diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
@@ -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)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
@@ -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);

diff --git a/init/Kconfig b/init/Kconfig
@@ -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

diff --git a/mm/Makefile b/mm/Makefile
@@ -5,14 +5,15 @@
 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 \
 			   readahead.o swap.o truncate.o vmscan.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