[Devel] Re: [PATCH -mmotm 3/3] memcg: dirty pages instrumentation

[Andrea Righi]

On Tue, Mar 02, 2010 at 12:11:10PM +0200, Kirill A. Shutemov wrote:
> On Mon, Mar 1, 2010 at 11:23 PM, Andrea Righi <arighi at develer.com> wrote:
> > Apply the cgroup dirty pages accounting and limiting infrastructure to
> > the opportune kernel functions.
> >
> > Signed-off-by: Andrea Righi <arighi at develer.com>
> > ---
> >  fs/fuse/file.c      |    5 +++
> >  fs/nfs/write.c      |    4 ++
> >  fs/nilfs2/segment.c |   10 +++++-
> >  mm/filemap.c        |    1 +
> >  mm/page-writeback.c |   84 ++++++++++++++++++++++++++++++++------------------
> >  mm/rmap.c           |    4 +-
> >  mm/truncate.c       |    2 +
> >  7 files changed, 76 insertions(+), 34 deletions(-)
> >
> > diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> > index a9f5e13..dbbdd53 100644
> > --- a/fs/fuse/file.c
> > +++ b/fs/fuse/file.c
> > @@ -11,6 +11,7 @@
> >  #include <linux/pagemap.h>
> >  #include <linux/slab.h>
> >  #include <linux/kernel.h>
> > +#include <linux/memcontrol.h>
> >  #include <linux/sched.h>
> >  #include <linux/module.h>
> >
> > @@ -1129,6 +1130,8 @@ static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req)
> >
> >        list_del(&req->writepages_entry);
> >        dec_bdi_stat(bdi, BDI_WRITEBACK);
> > +       mem_cgroup_update_stat(req->pages[0],
> > +                       MEM_CGROUP_STAT_WRITEBACK_TEMP, -1);
> >        dec_zone_page_state(req->pages[0], NR_WRITEBACK_TEMP);
> >        bdi_writeout_inc(bdi);
> >        wake_up(&fi->page_waitq);
> > @@ -1240,6 +1243,8 @@ static int fuse_writepage_locked(struct page *page)
> >        req->inode = inode;
> >
> >        inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK);
> > +       mem_cgroup_update_stat(tmp_page,
> > +                       MEM_CGROUP_STAT_WRITEBACK_TEMP, 1);
> >        inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
> >        end_page_writeback(page);
> >
> > diff --git a/fs/nfs/write.c b/fs/nfs/write.c
> > index b753242..7316f7a 100644
> > --- a/fs/nfs/write.c
> > +++ b/fs/nfs/write.c
> > @@ -439,6 +439,7 @@ nfs_mark_request_commit(struct nfs_page *req)
> >                        req->wb_index,
> >                        NFS_PAGE_TAG_COMMIT);
> >        spin_unlock(&inode->i_lock);
> > +       mem_cgroup_update_stat(req->wb_page, MEM_CGROUP_STAT_UNSTABLE_NFS, 1);
> >        inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
> >        inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_UNSTABLE);
> >        __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
> > @@ -450,6 +451,7 @@ nfs_clear_request_commit(struct nfs_page *req)
> >        struct page *page = req->wb_page;
> >
> >        if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) {
> > +               mem_cgroup_update_stat(page, MEM_CGROUP_STAT_UNSTABLE_NFS, -1);
> >                dec_zone_page_state(page, NR_UNSTABLE_NFS);
> >                dec_bdi_stat(page->mapping->backing_dev_info, BDI_UNSTABLE);
> >                return 1;
> > @@ -1273,6 +1275,8 @@ nfs_commit_list(struct inode *inode, struct list_head *head, int how)
> >                req = nfs_list_entry(head->next);
> >                nfs_list_remove_request(req);
> >                nfs_mark_request_commit(req);
> > +               mem_cgroup_update_stat(req->wb_page,
> > +                               MEM_CGROUP_STAT_UNSTABLE_NFS, -1);
> >                dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
> >                dec_bdi_stat(req->wb_page->mapping->backing_dev_info,
> >                                BDI_UNSTABLE);
> > diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
> > index ada2f1b..aef6d13 100644
> > --- a/fs/nilfs2/segment.c
> > +++ b/fs/nilfs2/segment.c
> > @@ -1660,8 +1660,11 @@ nilfs_copy_replace_page_buffers(struct page *page, struct list_head *out)
> >        } while (bh = bh->b_this_page, bh2 = bh2->b_this_page, bh != head);
> >        kunmap_atomic(kaddr, KM_USER0);
> >
> > -       if (!TestSetPageWriteback(clone_page))
> > +       if (!TestSetPageWriteback(clone_page)) {
> > +               mem_cgroup_update_stat(clone_page,
> 
> s/clone_page/page/

mmh... shouldn't we use the same page used by TestSetPageWriteback() and
inc_zone_page_state()?

> 
> And #include <linux/memcontrol.h> is missed.

OK.

I'll apply your fixes and post a new version.

Thanks for reviewing,
-Andrea
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