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Message-Id: <1184033296.6005.442.camel@localhost.localdomain>
Date: Tue, 10 Jul 2007 12:08:16 +1000
From: Rusty Russell <rusty@...tcorp.com.au>
To: Matt Mackall <mpm@...enic.com>
Cc: Jeremy Fitzhardinge <jeremy@...p.org>,
David Rientjes <rientjes@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: maps2-make-proc-pid-smaps-optional-under-config_embedded.patch
On Mon, 2007-07-09 at 15:24 -0500, Matt Mackall wrote:
> On Sun, Jul 08, 2007 at 04:19:34PM +1000, Rusty Russell wrote:
> > Matt wrote:
> > > This interface is primarily useful for doing memory profiling and not much use
> > > on deployed embedded boxes. Make it optional. Together with
> > > /proc/pid/clear_refs, this save a few K.
> >
> > How about a single config option for all these?
>
> I suppose. This looks like half a patch though. I think you forgot a
> quilt add somewhere.
Yep: I forgot hg qrefresh 8)
==
maps2-CONFIG_PROC_PAGE_MONITOR.patch
Merge the three config options PROC_SMAPS/PROC_CLEAR_REFS/PROC_PAGEMAP
and report the approximate memory usage (i386 SMP).
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
diff -r 5a7ada4f5442 fs/proc/base.c
--- a/fs/proc/base.c Sun Jul 08 15:29:26 2007 +1000
+++ b/fs/proc/base.c Sun Jul 08 16:07:14 2007 +1000
@@ -2029,13 +2029,9 @@ static const struct pid_entry tgid_base_
REG("mounts", S_IRUGO, mounts),
REG("mountstats", S_IRUSR, mountstats),
#ifdef CONFIG_MMU
-#ifdef CONFIG_PROC_CLEAR_REFS
+#ifdef CONFIG_PROC_PAGE_MONITOR
REG("clear_refs", S_IWUSR, clear_refs),
-#endif
-#ifdef CONFIG_PROC_SMAPS
REG("smaps", S_IRUGO, smaps),
-#endif
-#ifdef CONFIG_PROC_PAGEMAP
REG("pagemap", S_IRUSR, pagemap),
#endif
#endif
@@ -2323,13 +2319,9 @@ static const struct pid_entry tid_base_s
LNK("exe", exe),
REG("mounts", S_IRUGO, mounts),
#ifdef CONFIG_MMU
-#ifdef CONFIG_PROC_CLEAR_REFS
+#ifdef CONFIG_PROC_PAGE_MONITOR
REG("clear_refs", S_IWUSR, clear_refs),
-#endif
-#ifdef CONFIG_PROC_SMAPS
REG("smaps", S_IRUGO, smaps),
-#endif
-#ifdef CONFIG_PROC_PAGEMAP
REG("pagemap", S_IRUSR, pagemap),
#endif
#endif
diff -r 5a7ada4f5442 fs/proc/proc_misc.c
--- a/fs/proc/proc_misc.c Sun Jul 08 15:29:26 2007 +1000
+++ b/fs/proc/proc_misc.c Sun Jul 08 21:40:57 2007 +1000
@@ -661,7 +661,7 @@ static const struct file_operations proc
};
#endif
-#ifdef CONFIG_PROC_KPAGEMAP
+#ifdef CONFIG_PROC_PAGE_MONITOR
#define KPMSIZE (sizeof(unsigned long) * 2)
#define KPMMASK (KPMSIZE - 1)
/* /proc/kpagemap - an array exposing page flags and counts
@@ -688,7 +688,7 @@ static ssize_t kpagemap_read(struct file
int chunk, i;
pfn = src / KPMSIZE - 1;
- count = min_t(size_t, count, ((max_pfn + 1) * KPMSIZE) - src);
+ count = min(count, ((max_pfn + 1) * KPMSIZE) - src);
if (src & KPMMASK || count & KPMMASK)
return -EIO;
@@ -960,7 +960,7 @@ void __init proc_misc_init(void)
(size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
}
#endif
-#ifdef CONFIG_PROC_KPAGEMAP
+#ifdef CONFIG_PROC_PAGE_MONITOR
proc_kpagemap = create_proc_entry("kpagemap", S_IRUSR, NULL);
if (proc_kpagemap)
proc_kpagemap->proc_fops = &proc_kpagemap_operations;
diff -r 5a7ada4f5442 fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c Sun Jul 08 15:29:26 2007 +1000
+++ b/fs/proc/task_mmu.c Sun Jul 08 16:09:34 2007 +1000
@@ -315,7 +315,7 @@ const struct file_operations proc_maps_o
.release = seq_release_private,
};
-#ifdef CONFIG_PROC_SMAPS
+#ifdef CONFIG_PROC_PAGE_MONITOR
struct mem_size_stats
{
unsigned long resident;
@@ -429,9 +429,7 @@ const struct file_operations proc_smaps_
.llseek = seq_lseek,
.release = seq_release_private,
};
-#endif
-
-#ifdef CONFIG_PROC_CLEAR_REFS
+
static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
unsigned long end, void *private)
{
@@ -501,43 +499,7 @@ const struct file_operations proc_clear_
const struct file_operations proc_clear_refs_operations = {
.write = clear_refs_write,
};
-#endif
-
-#ifdef CONFIG_NUMA
-extern int show_numa_map(struct seq_file *m, void *v);
-
-static int show_numa_map_checked(struct seq_file *m, void *v)
-{
- struct proc_maps_private *priv = m->private;
- struct task_struct *task = priv->task;
-
- if (maps_protect && !ptrace_may_attach(task))
- return -EACCES;
-
- return show_numa_map(m, v);
-}
-
-static struct seq_operations proc_pid_numa_maps_op = {
- .start = m_start,
- .next = m_next,
- .stop = m_stop,
- .show = show_numa_map_checked
-};
-
-static int numa_maps_open(struct inode *inode, struct file *file)
-{
- return do_maps_open(inode, file, &proc_pid_numa_maps_op);
-}
-
-const struct file_operations proc_numa_maps_operations = {
- .open = numa_maps_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_private,
-};
-#endif
-
-#ifdef CONFIG_PROC_PAGEMAP
+
struct pagemapread {
struct mm_struct *mm;
unsigned long next;
@@ -744,4 +706,38 @@ const struct file_operations proc_pagema
.llseek = mem_lseek, /* borrow this */
.read = pagemap_read,
};
-#endif
+#endif /* CONFIG_PROC_PAGE_MONITOR */
+
+#ifdef CONFIG_NUMA
+extern int show_numa_map(struct seq_file *m, void *v);
+
+static int show_numa_map_checked(struct seq_file *m, void *v)
+{
+ struct proc_maps_private *priv = m->private;
+ struct task_struct *task = priv->task;
+
+ if (maps_protect && !ptrace_may_attach(task))
+ return -EACCES;
+
+ return show_numa_map(m, v);
+}
+
+static struct seq_operations proc_pid_numa_maps_op = {
+ .start = m_start,
+ .next = m_next,
+ .stop = m_stop,
+ .show = show_numa_map_checked
+};
+
+static int numa_maps_open(struct inode *inode, struct file *file)
+{
+ return do_maps_open(inode, file, &proc_pid_numa_maps_op);
+}
+
+const struct file_operations proc_numa_maps_operations = {
+ .open = numa_maps_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
+};
+#endif /* CONFIG_NUMA */
diff -r 5a7ada4f5442 init/Kconfig
--- a/init/Kconfig Sun Jul 08 15:29:26 2007 +1000
+++ b/init/Kconfig Sun Jul 08 16:01:35 2007 +1000
@@ -636,32 +636,14 @@ config SLOB
endchoice
-config PROC_SMAPS
- default y
- bool "Enable /proc/pid/smaps support" if EMBEDDED && PROC_FS && MMU
- help
- The /proc/pid/smaps interface reports a process's private and
- shared memory per mapping. Disabling this interface will reduce
- the size of the kernel for small machines.
-
-config PROC_CLEAR_REFS
- default y
- bool "Enable /proc/pid/clear_refs support" if EMBEDDED && PROC_FS && MMU
- help
- The /proc/pid/clear_refs interface allows clearing the
- referenced bits on a process's memory maps to allow monitoring
- working set size. Disabling this interface will reduce
- the size of the kernel for small machines.
-
-config PROC_PAGEMAP
- default y
- bool "Enable /proc/pid/pagemap support" if EMBEDDED && PROC_FS && MMU
- help
- The /proc/pid/pagemap interface allows reading the
- kernel's virtual memory to page frame mapping to determine which
- individual pages a process has mapped and which pages it shares
- with other processes. Disabling this interface will reduce the
- size of the kernel for small machines.
+config PROC_PAGE_MONITOR
+ default y
+ bool "Enable /proc page monitoring" if EMBEDDED && PROC_FS && MMU
+ help
+ Various /proc files exist to monitor process memory utilization:
+ /proc/pid/smaps, /proc/pid/clear_refs and /proc/pid/pagemap.
+ Disabling these interfaces will reduce the size of the kernel by
+ approximately 4kb.
config PROC_KPAGEMAP
default y
@@ -670,7 +652,7 @@ config PROC_KPAGEMAP
The /proc/pid/kpagemap interface allows reading the
kernel's per-page flag and usage counts to gather precise
information on page-level memory usage. Disabling this interface
- will reduce the size of the kernel for small machines.
+ will reduce the size of the kernel by around 600 bytes.
endmenu # General setup
-
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