swap,blkcg: issue swap io with the appropriate context

For backcharging we need to know who the page belongs to when swapping
it out.  We don't worry about things that do ->rw_page (zram etc) at the
moment, we're only worried about pages that actually go to a block
device.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/bio.c b/block/bio.c
index 0445715..5f84f5c 100644 (file)
--- a/block/bio.c
+++ b/block/bio.c
@@ -2015,6 +2015,30 @@ EXPORT_SYMBOL(bioset_init_from_src);
 
 #ifdef CONFIG_BLK_CGROUP
 
+#ifdef CONFIG_MEMCG
+/**
+ * bio_associate_blkcg_from_page - associate a bio with the page's blkcg
+ * @bio: target bio
+ * @page: the page to lookup the blkcg from
+ *
+ * Associate @bio with the blkcg from @page's owning memcg.  This works like
+ * every other associate function wrt references.
+ */
+int bio_associate_blkcg_from_page(struct bio *bio, struct page *page)
+{
+       struct cgroup_subsys_state *blkcg_css;
+
+       if (unlikely(bio->bi_css))
+               return -EBUSY;
+       if (!page->mem_cgroup)
+               return 0;
+       blkcg_css = cgroup_get_e_css(page->mem_cgroup->css.cgroup,
+                                    &io_cgrp_subsys);
+       bio->bi_css = blkcg_css;
+       return 0;
+}
+#endif /* CONFIG_MEMCG */
+
 /**
  * bio_associate_blkcg - associate a bio with the specified blkcg
  * @bio: target bio

diff --git a/include/linux/bio.h b/include/linux/bio.h
index a279ba3..a00dfff 100644 (file)
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -553,6 +553,13 @@ do {                                               \
 #define bio_dev(bio) \
        disk_devt((bio)->bi_disk)
 
+#if defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP)
+int bio_associate_blkcg_from_page(struct bio *bio, struct page *page);
+#else
+static inline int bio_associate_blkcg_from_page(struct bio *bio,
+                                               struct page *page) {  return 0; }
+#endif
+
 #ifdef CONFIG_BLK_CGROUP
 int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css);
 int bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg);

diff --git a/mm/page_io.c b/mm/page_io.c
index a552cb3..aafd19e 100644 (file)
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -339,6 +339,7 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
                goto out;
        }
        bio->bi_opf = REQ_OP_WRITE | REQ_SWAP | wbc_to_write_flags(wbc);
+       bio_associate_blkcg_from_page(bio, page);
        count_swpout_vm_event(page);
        set_page_writeback(page);
        unlock_page(page);