Group short-lived and reclaimable kernel allocations

This patch marks a number of allocations that are either short-lived such as
network buffers or are reclaimable such as inode allocations.  When something
like updatedb is called, long-lived and unmovable kernel allocations tend to
be spread throughout the address space which increases fragmentation.

This patch groups these allocations together as much as possible by adding a
new MIGRATE_TYPE.  The MIGRATE_RECLAIMABLE type is for allocations that can be
reclaimed on demand, but not moved.  i.e.  they can be migrated by deleting
them and re-reading the information from elsewhere.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 8 insertions, 7 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index e5d0953d4db1..78fdfea1a7f8 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -492,7 +492,7 @@ static ssize_t proc_info_read(struct file * file, char __user * buf,
                 count = PROC_BLOCK_SIZE;
 
         length = -ENOMEM;
-        if (!(page = __get_free_page(GFP_KERNEL)))
+        if (!(page = __get_free_page(GFP_TEMPORARY)))
                 goto out;
 
         length = PROC_I(inode)->op.proc_read(task, (char*)page);
@@ -532,7 +532,7 @@ static ssize_t mem_read(struct file * file, char __user * buf,
                 goto out;
 
         ret = -ENOMEM;
-        page = (char *)__get_free_page(GFP_USER);
+        page = (char *)__get_free_page(GFP_TEMPORARY);
         if (!page)
                 goto out;
 
@@ -602,7 +602,7 @@ static ssize_t mem_write(struct file * file, const char __user *buf,
                 goto out;
 
         copied = -ENOMEM;
-        page = (char *)__get_free_page(GFP_USER);
+        page = (char *)__get_free_page(GFP_TEMPORARY);
         if (!page)
                 goto out;
 
@@ -788,7 +788,7 @@ static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
                 /* No partial writes. */
                 return -EINVAL;
         }
-        page = (char*)__get_free_page(GFP_USER);
+        page = (char*)__get_free_page(GFP_TEMPORARY);
         if (!page)
                 return -ENOMEM;
         length = -EFAULT;
@@ -954,7 +954,8 @@ static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt,
                             char __user *buffer, int buflen)
 {
         struct inode * inode;
-        char *tmp = (char*)__get_free_page(GFP_KERNEL), *path;
+        char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
+        char *path;
         int len;
 
         if (!tmp)
@@ -1726,7 +1727,7 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
                 goto out;
 
         length = -ENOMEM;
-        page = (char*)__get_free_page(GFP_USER);
+        page = (char*)__get_free_page(GFP_TEMPORARY);
         if (!page)
                 goto out;
 
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index b5e7155d30d8..1bdb62435758 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -74,7 +74,7 @@ proc_file_read(struct file *file, char __user *buf, size_t nbytes,
                 nbytes = MAX_NON_LFS - pos;
 
         dp = PDE(inode);
-        if (!(page = (char*) __get_free_page(GFP_KERNEL)))
+        if (!(page = (char*) __get_free_page(GFP_TEMPORARY)))
                 return -ENOMEM;
 
         while ((nbytes > 0) && !eof) {