Re: [PATCH] A new entry for /proc
From: Mauricio Lin
Date: Mon Jan 17 2005 - 13:19:40 EST
Hi Andrew,
Sorry for the patch errors.
Here goes the fixed patch. I used the xemacs editor for copying it.
The others editor (emacs and pico) I tried do not copy the patch
rightly. The patch copying also does not work with webmail.
diff -uprN linux-2.6.10/Documentation/filesystems/proc.txt
linux-2.6.10-smaps/Documentation/filesystems/proc.txt
--- linux-2.6.10/Documentation/filesystems/proc.txt 2004-12-24
17:34:29.000000000 -0400
+++ linux-2.6.10-smaps/Documentation/filesystems/proc.txt 2005-01-17
11:29:31.000000000 -0400
@@ -133,6 +133,7 @@ Table 1-1: Process specific entries in /
statm Process memory status information
status Process status in human readable form
wchan If CONFIG_KALLSYMS is set, a pre-decoded wchan
+ smaps Extension of maps, presenting the rss size for each mapped file
..............................................................................
For example, to get the status information of a process, all you have to do is
diff -uprN linux-2.6.10/fs/proc/base.c linux-2.6.10-smaps/fs/proc/base.c
--- linux-2.6.10/fs/proc/base.c 2004-12-24 17:35:00.000000000 -0400
+++ linux-2.6.10-smaps/fs/proc/base.c 2005-01-17 12:11:01.000000000 -0400
@@ -11,6 +11,24 @@
* go into icache. We cache the reference to task_struct upon lookup too.
* Eventually it should become a filesystem in its own. We don't use the
* rest of procfs anymore.
+ *
+ *
+ * Changelog:
+ * 17-Jan-2005
+ * Allan Bezerra
+ * Bruna Moreira <bruna.moreira@xxxxxxxxxxx>
+ * Edjard Mota <edjard.mota@xxxxxxxxxxx>
+ * Ilias Biris <ext-ilias.biris@xxxxxxxxxxx>
+ * Mauricio Lin <mauricio.lin@xxxxxxxxxxx>
+ *
+ * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
+ *
+ * A new process specific entry (smaps) included in /proc. It shows the
+ * size of rss for each memory area. The maps entry lacks information
+ * about physical memory size (rss) for each mapped file, i.e.,
+ * rss information for executables and library files.
+ * This additional information is useful for any tools that need to know
+ * about physical memory consumption for a process specific library.
*/
#include <asm/uaccess.h>
@@ -60,6 +78,7 @@ enum pid_directory_inos {
PROC_TGID_MAPS,
PROC_TGID_MOUNTS,
PROC_TGID_WCHAN,
+ PROC_TGID_SMAPS,
#ifdef CONFIG_SCHEDSTATS
PROC_TGID_SCHEDSTAT,
#endif
@@ -86,6 +105,7 @@ enum pid_directory_inos {
PROC_TID_MAPS,
PROC_TID_MOUNTS,
PROC_TID_WCHAN,
+ PROC_TID_SMAPS,
#ifdef CONFIG_SCHEDSTATS
PROC_TID_SCHEDSTAT,
#endif
@@ -123,6 +143,7 @@ static struct pid_entry tgid_base_stuff[
E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO),
E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO),
E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
+ E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO),
#ifdef CONFIG_SECURITY
E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
#endif
@@ -148,6 +169,7 @@ static struct pid_entry tid_base_stuff[]
E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO),
E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO),
E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
+ E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO),
#ifdef CONFIG_SECURITY
E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
#endif
@@ -497,6 +519,25 @@ static struct file_operations proc_maps_
.release = seq_release,
};
+extern struct seq_operations proc_pid_smaps_op;
+static int smaps_open(struct inode *inode, struct file *file)
+{
+ struct task_struct *task = proc_task(inode);
+ int ret = seq_open(file, &proc_pid_smaps_op);
+ if (!ret) {
+ struct seq_file *m = file->private_data;
+ m->private = task;
+ }
+ return ret;
+}
+
+static struct file_operations proc_smaps_operations = {
+ .open = smaps_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
extern struct seq_operations mounts_op;
static int mounts_open(struct inode *inode, struct file *file)
{
@@ -1341,6 +1382,11 @@ static struct dentry *proc_pident_lookup
case PROC_TGID_MOUNTS:
inode->i_fop = &proc_mounts_operations;
break;
+ case PROC_TID_SMAPS:
+ case PROC_TGID_SMAPS:
+ inode->i_fop = &proc_smaps_operations;
+ break;
+
#ifdef CONFIG_SECURITY
case PROC_TID_ATTR:
inode->i_nlink = 2;
diff -uprN linux-2.6.10/fs/proc/task_mmu.c linux-2.6.10-smaps/fs/proc/task_mmu.c
--- linux-2.6.10/fs/proc/task_mmu.c 2004-12-24 17:34:01.000000000 -0400
+++ linux-2.6.10-smaps/fs/proc/task_mmu.c 2005-01-17 09:29:38.000000000 -0400
@@ -81,6 +81,75 @@ static int show_map(struct seq_file *m,
return 0;
}
+static void resident_mem_size(struct mm_struct *mm,
+ unsigned long start_address,
+ unsigned long end_address,
+ unsigned long *size)
+{
+ pgd_t *pgd;
+ pmd_t *pmd;
+ pte_t *ptep, pte;
+ unsigned long each_page;
+
+ for (each_page = start_address; each_page < end_address; each_page
+= PAGE_SIZE) {
+ pgd = pgd_offset(mm, each_page);
+ if (pgd_none(*pgd) || unlikely(pgd_bad(*pgd)))
+ continue;
+
+ pmd = pmd_offset(pgd, each_page);
+
+ if (pmd_none(*pmd))
+ continue;
+
+ if (unlikely(pmd_bad(*pmd)))
+ continue;
+
+ if (pmd_present(*pmd)) {
+ ptep = pte_offset_map(pmd, each_page);
+ if (!ptep)
+ continue;
+ pte = *ptep;
+ pte_unmap(ptep);
+ if (pte_present(pte))
+ *size += PAGE_SIZE;
+ }
+ }
+}
+
+static int show_smap(struct seq_file *m, void *v)
+{
+ struct vm_area_struct *map = v;
+ struct file *file = map->vm_file;
+ int flags = map->vm_flags;
+ struct mm_struct *mm = map->vm_mm;
+ unsigned long rss = 0;
+ unsigned long vma_len = (map->vm_end - map->vm_start) >> 10;
+
+ if (mm) {
+ resident_mem_size(mm, map->vm_start, map->vm_end, &rss);
+ }
+
+ seq_printf(m, "%08lx-%08lx %c%c%c%c ",
+ map->vm_start,
+ map->vm_end,
+ flags & VM_READ ? 'r' : '-',
+ flags & VM_WRITE ? 'w' : '-',
+ flags & VM_EXEC ? 'x' : '-',
+ flags & VM_MAYSHARE ? 's' : 'p');
+
+ if (map->vm_file)
+ seq_path(m, file->f_vfsmnt, file->f_dentry, " \t\n\\");
+
+ seq_putc(m, '\n');
+
+ seq_printf(m, "Size:%8lu kB\n"
+ "Rss:%8lu kB\n",
+ vma_len,
+ rss >> 10);
+
+ return 0;
+}
+
static void *m_start(struct seq_file *m, loff_t *pos)
{
struct task_struct *task = m->private;
@@ -134,3 +203,10 @@ struct seq_operations proc_pid_maps_op =
.stop = m_stop,
.show = show_map
};
+
+struct seq_operations proc_pid_smaps_op = {
+ .start = m_start,
+ .next = m_next,
+ .stop = m_stop,
+ .show = show_smap
+};
-
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