[PATCH] zoned vm counters: conversion of nr_dirty to per zone counter

This makes nr_dirty a per zone counter.  Looping over all processors is
avoided during writeback state determination.

The counter aggregation for nr_dirty had to be undone in the NFS layer since
we summed up the page counts from multiple zones.  Someone more familiar with
NFS should probably review what I have done.

[akpm@osdl.org: bugfix]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 2 insertions, 2 deletions

diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index d89f6fb3b3a3..26b1fe909377 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -315,6 +315,7 @@ nfs_scan_lock_dirty(struct nfs_inode *nfsi, struct list_head *dst,
                                                 req->wb_index, NFS_PAGE_TAG_DIRTY);
                                 nfs_list_remove_request(req);
                                 nfs_list_add_request(req, dst);
+                                dec_zone_page_state(req->wb_page, NR_FILE_DIRTY);
                                 res++;
                         }
                 }
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 8fccb9cb173b..a6d1ca513dde 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -497,7 +497,7 @@ nfs_mark_request_dirty(struct nfs_page *req)
         nfs_list_add_request(req, &nfsi->dirty);
         nfsi->ndirty++;
         spin_unlock(&nfsi->req_lock);
-        inc_page_state(nr_dirty);
+        inc_zone_page_state(req->wb_page, NR_FILE_DIRTY);
         mark_inode_dirty(inode);
 }
 
@@ -609,7 +609,6 @@ nfs_scan_dirty(struct inode *inode, struct list_head *dst, unsigned long idx_sta
         if (nfsi->ndirty != 0) {
                 res = nfs_scan_lock_dirty(nfsi, dst, idx_start, npages);
                 nfsi->ndirty -= res;
-                sub_page_state(nr_dirty,res);
                 if ((nfsi->ndirty == 0) != list_empty(&nfsi->dirty))
                         printk(KERN_ERR "NFS: desynchronized value of nfs_i.ndirty.\n");
         }