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authorMatt Mackall <mpm@selenic.com>2008-02-04 22:29:04 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:16 -0800
commit85863e475e59afb027b0113290e3796ee6020b7d (patch)
tree047cc687b98c0261bd3c083f17c090fbf082355f /fs/proc/base.c
parenta6198797cc3fd659b2d81cdf6bb6b9bba9cd93e9 (diff)
maps4: add /proc/pid/pagemap interface
This interface provides a mapping for each page in an address space to its physical page frame number, allowing precise determination of what pages are mapped and what pages are shared between processes. New in this version: - headers gone again (as recommended by Dave Hansen and Alan Cox) - 64-bit entries (as per discussion with Andi Kleen) - swap pte information exported (from Dave Hansen) - page walker callback for holes (from Dave Hansen) - direct put_user I/O (as suggested by Rusty Russell) This patch folds in cleanups and swap PTE support from Dave Hansen <haveblue@us.ibm.com>. 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>
Diffstat (limited to 'fs/proc/base.c')
-rw-r--r--fs/proc/base.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 1bd646d3fe9..9004db04efa 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -783,7 +783,7 @@ out_no_task:
}
#endif
-static loff_t mem_lseek(struct file * file, loff_t offset, int orig)
+loff_t mem_lseek(struct file *file, loff_t offset, int orig)
{
switch (orig) {
case 0:
@@ -2252,6 +2252,7 @@ static const struct pid_entry tgid_base_stuff[] = {
#ifdef CONFIG_MMU
REG("clear_refs", S_IWUSR, clear_refs),
REG("smaps", S_IRUGO, smaps),
+ REG("pagemap", S_IRUSR, pagemap),
#endif
#ifdef CONFIG_SECURITY
DIR("attr", S_IRUGO|S_IXUGO, attr_dir),
@@ -2580,6 +2581,7 @@ static const struct pid_entry tid_base_stuff[] = {
#ifdef CONFIG_MMU
REG("clear_refs", S_IWUSR, clear_refs),
REG("smaps", S_IRUGO, smaps),
+ REG("pagemap", S_IRUSR, pagemap),
#endif
#ifdef CONFIG_SECURITY
DIR("attr", S_IRUGO|S_IXUGO, attr_dir),