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Subject[PATCH 1/6] Add IO cgroup tracking for buffered writes.
Date
This patch adds IO tracking code in the mm/ tree so that the block layer
can provide isolation for buffered writes. I've left modifying the
page_cgroup structure as simple as possible; I'm happy to change this to
using bits as part of the "flags" structure to reduce overhead.

Signed-off-by: Justin TerAvest <teravest@google.com>
---
block/blk-cgroup.c | 184 +++++++++++++++++++++++++++++++++++++++++++
fs/buffer.c | 2 +
fs/direct-io.c | 2 +
include/linux/blkio-track.h | 89 +++++++++++++++++++++
include/linux/iocontext.h | 1 +
include/linux/memcontrol.h | 6 ++
include/linux/mmzone.h | 4 +-
include/linux/page_cgroup.h | 12 +++-
init/Kconfig | 16 ++++
mm/Makefile | 3 +-
mm/bounce.c | 2 +
mm/filemap.c | 2 +
mm/memcontrol.c | 6 ++
mm/memory.c | 6 ++
mm/page-writeback.c | 14 +++-
mm/page_cgroup.c | 29 +++++---
mm/swap_state.c | 2 +
17 files changed, 363 insertions(+), 17 deletions(-)
create mode 100644 include/linux/blkio-track.h
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 455768a..80d88ec 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -19,6 +19,8 @@
#include <linux/slab.h>
#include "blk-cgroup.h"
#include <linux/genhd.h>
+#include <linux/blkio-track.h>
+#include <linux/mm_inline.h>

#define MAX_KEY_LEN 100

@@ -175,6 +177,12 @@ static inline void blkio_update_group_iops(struct blkio_group *blkg,
}
}

+static inline struct blkio_cgroup *blkio_cgroup_from_task(struct task_struct *p)
+{
+ return container_of(task_subsys_state(p, blkio_subsys_id),
+ struct blkio_cgroup, css);
+}
+
/*
* Add to the appropriate stat variable depending on the request type.
* This should be called with the blkg->stats_lock held.
@@ -1233,8 +1241,20 @@ blkiocg_file_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val)
return 0;
}

+/* Read the ID of the specified blkio cgroup. */
+static u64 blkio_id_read(struct cgroup *cgrp, struct cftype *cft)
+{
+ struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
+
+ return (u64)css_id(&blkcg->css);
+}
+
struct cftype blkio_files[] = {
{
+ .name = "id",
+ .read_u64 = blkio_id_read,
+ },
+ {
.name = "weight_device",
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
BLKIO_PROP_weight_device),
@@ -1385,6 +1405,170 @@ struct cftype blkio_files[] = {
#endif
};

+/* Block IO tracking related functions */
+
+#ifdef CONFIG_CGROUP_BLKIOTRACK
+
+/*
+ * The block I/O tracking mechanism is implemented on the cgroup memory
+ * controller framework. It helps to find the the owner of an I/O request
+ * because every I/O request has a target page and the owner of the page
+ * can be easily determined on the framework.
+ */
+
+/**
+ * blkio_cgroup_set_owner() - set the owner ID of a page.
+ * @page: the page we want to tag
+ * @mm: the mm_struct of a page owner
+ *
+ * Make a given page have the blkio-cgroup ID of the owner of this page.
+ */
+void blkio_cgroup_set_owner(struct page *page, struct mm_struct *mm)
+{
+ struct blkio_cgroup *blkcg;
+ struct page_cgroup *pc;
+
+ if (blkio_cgroup_disabled())
+ return;
+ pc = lookup_page_cgroup(page);
+ if (unlikely(!pc))
+ return;
+
+ pc->blkio_cgroup_id = 0; /* 0: default blkio_cgroup id */
+ if (!mm)
+ return;
+ /*
+ * Locking "pc" isn't necessary here since the current process is
+ * the only one that can access the members related to blkio_cgroup.
+ */
+ rcu_read_lock();
+ blkcg = blkio_cgroup_from_task(rcu_dereference(mm->owner));
+ if (unlikely(!blkcg))
+ goto out;
+ /*
+ * css_get(&bio->css) isn't called to increment the reference
+ * count of this blkio_cgroup "blkcg" so pc->blkio_cgroup_id
+ * might turn invalid even if this page is still active.
+ * This approach is chosen to minimize the overhead.
+ */
+ pc->blkio_cgroup_id = css_id(&blkcg->css);
+out:
+ rcu_read_unlock();
+}
+
+/**
+ * blkio_cgroup_reset_owner() - reset the owner ID of a page
+ * @page: the page we want to tag
+ * @mm: the mm_struct of a page owner
+ *
+ * Change the owner of a given page if necessary.
+ */
+void blkio_cgroup_reset_owner(struct page *page, struct mm_struct *mm)
+{
+ /*
+ * A little trick:
+ * Just call blkio_cgroup_set_owner() for pages which are already
+ * active since the blkio_cgroup_id member of page_cgroup can be
+ * updated without any locks. This is because an integer type of
+ * variable can be set a new value at once on modern cpus.
+ */
+ blkio_cgroup_set_owner(page, mm);
+}
+
+/**
+ * blkio_cgroup_reset_owner_pagedirty() - reset the owner ID of a pagecache page
+ * @page: the page we want to tag
+ * @mm: the mm_struct of a page owner
+ *
+ * Change the owner of a given page if the page is in the pagecache.
+ */
+void blkio_cgroup_reset_owner_pagedirty(struct page *page, struct mm_struct *mm)
+{
+ if (!page_is_file_cache(page))
+ return;
+ if (current->flags & PF_MEMALLOC)
+ return;
+
+ blkio_cgroup_reset_owner(page, mm);
+}
+
+/**
+ * blkio_cgroup_copy_owner() - copy the owner ID of a page into another page
+ * @npage: the page where we want to copy the owner
+ * @opage: the page from which we want to copy the ID
+ *
+ * Copy the owner ID of @opage into @npage.
+ */
+void blkio_cgroup_copy_owner(struct page *npage, struct page *opage)
+{
+ struct page_cgroup *npc, *opc;
+
+ if (blkio_cgroup_disabled())
+ return;
+ npc = lookup_page_cgroup(npage);
+ if (unlikely(!npc))
+ return;
+ opc = lookup_page_cgroup(opage);
+ if (unlikely(!opc))
+ return;
+
+ /*
+ * Do this without any locks. The reason is the same as
+ * blkio_cgroup_reset_owner().
+ */
+ npc->blkio_cgroup_id = opc->blkio_cgroup_id;
+}
+
+/**
+ * get_blkio_cgroup_id() - determine the blkio-cgroup ID
+ * @bio: the &struct bio which describes the I/O
+ *
+ * Returns the blkio-cgroup ID of a given bio. A return value zero
+ * means that the page associated with the bio belongs to default_blkio_cgroup.
+ */
+unsigned long get_blkio_cgroup_id(struct bio *bio)
+{
+ struct page_cgroup *pc;
+ struct page *page = bio_iovec_idx(bio, 0)->bv_page;
+ unsigned long id = 0;
+
+ pc = lookup_page_cgroup(page);
+ if (pc)
+ id = pc->blkio_cgroup_id;
+ return id;
+}
+
+/**
+ * get_cgroup_from_page() - determine the cgroup from a page.
+ * @page: the page to be tracked
+ *
+ * Returns the cgroup of a given page. A return value zero means that
+ * the page associated with the page belongs to default_blkio_cgroup.
+ *
+ * Note:
+ * This function must be called under rcu_read_lock().
+ */
+struct cgroup *get_cgroup_from_page(struct page *page)
+{
+ struct page_cgroup *pc;
+ struct cgroup_subsys_state *css;
+
+ pc = lookup_page_cgroup(page);
+ if (!pc)
+ return NULL;
+
+ css = css_lookup(&blkio_subsys, pc->blkio_cgroup_id);
+ if (!css)
+ return NULL;
+
+ return css->cgroup;
+}
+
+EXPORT_SYMBOL(get_blkio_cgroup_id);
+EXPORT_SYMBOL(get_cgroup_from_page);
+
+#endif /* CONFIG_CGROUP_BLKIOTRACK */
+
static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup)
{
return cgroup_add_files(cgroup, subsys, blkio_files,
diff --git a/fs/buffer.c b/fs/buffer.c
index 2219a76..1e911dd 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -36,6 +36,7 @@
#include <linux/buffer_head.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/bio.h>
+#include <linux/blkio-track.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/bitops.h>
@@ -667,6 +668,7 @@ static void __set_page_dirty(struct page *page,
if (page->mapping) { /* Race with truncate? */
WARN_ON_ONCE(warn && !PageUptodate(page));
account_page_dirtied(page, mapping);
+ blkio_cgroup_reset_owner_pagedirty(page, current->mm);
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
}
diff --git a/fs/direct-io.c b/fs/direct-io.c
index b044705..2e8d5aa 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -33,6 +33,7 @@
#include <linux/err.h>
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
+#include <linux/blkio-track.h>
#include <linux/rwsem.h>
#include <linux/uio.h>
#include <asm/atomic.h>
@@ -852,6 +853,7 @@ static int do_direct_IO(struct dio *dio)
ret = PTR_ERR(page);
goto out;
}
+ blkio_cgroup_reset_owner(page, current->mm);

while (block_in_page < blocks_per_page) {
unsigned offset_in_page = block_in_page << blkbits;
diff --git a/include/linux/blkio-track.h b/include/linux/blkio-track.h
new file mode 100644
index 0000000..aedf780
--- /dev/null
+++ b/include/linux/blkio-track.h
@@ -0,0 +1,89 @@
+#include <linux/cgroup.h>
+#include <linux/mm.h>
+#include <linux/page_cgroup.h>
+
+#ifndef _LINUX_BIOTRACK_H
+#define _LINUX_BIOTRACK_H
+
+#ifdef CONFIG_CGROUP_BLKIOTRACK
+
+struct block_device;
+
+/**
+ * __init_blkio_page_cgroup() - initialize a blkio_page_cgroup
+ * @pc: page_cgroup of the page
+ *
+ * Reset the owner ID of a page.
+ */
+static inline void __init_blkio_page_cgroup(struct page_cgroup *pc)
+{
+ pc->blkio_cgroup_id = 0;
+}
+
+/**
+ * blkio_cgroup_disabled() - check whether blkio_cgroup is disabled
+ *
+ * Returns true if disabled, false if not.
+ */
+static inline bool blkio_cgroup_disabled(void)
+{
+ if (blkio_subsys.disabled)
+ return true;
+ return false;
+}
+
+extern void blkio_cgroup_set_owner(struct page *page, struct mm_struct *mm);
+extern void blkio_cgroup_reset_owner(struct page *page, struct mm_struct *mm);
+extern void blkio_cgroup_reset_owner_pagedirty(struct page *page,
+ struct mm_struct *mm);
+extern void blkio_cgroup_copy_owner(struct page *page, struct page *opage);
+
+extern unsigned long get_blkio_cgroup_id(struct bio *bio);
+extern struct cgroup *get_cgroup_from_page(struct page *page);
+
+#else /* !CONFIG_CGROUP_BLKIOTRACK */
+
+struct blkiotrack_cgroup;
+
+static inline void __init_blkio_page_cgroup(struct page_cgroup *pc)
+{
+}
+
+static inline bool blkio_cgroup_disabled(void)
+{
+ return true;
+}
+
+static inline void blkio_cgroup_set_owner(struct page *page,
+ struct mm_struct *mm)
+{
+}
+
+static inline void blkio_cgroup_reset_owner(struct page *page,
+ struct mm_struct *mm)
+{
+}
+
+static inline void blkio_cgroup_reset_owner_pagedirty(struct page *page,
+ struct mm_struct *mm)
+{
+}
+
+static inline void blkio_cgroup_copy_owner(struct page *page,
+ struct page *opage)
+{
+}
+
+static inline unsigned long get_blkio_cgroup_id(struct bio *bio)
+{
+ return 0;
+}
+
+static inline struct cgroup *get_cgroup_from_page(struct page *page)
+{
+ return NULL;
+}
+
+#endif /* CONFIG_CGROUP_BLKIOTRACK */
+
+#endif /* _LINUX_BIOTRACK_H */
diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h
index b2eee89..3e70b21 100644
--- a/include/linux/iocontext.h
+++ b/include/linux/iocontext.h
@@ -76,6 +76,7 @@ int put_io_context(struct io_context *ioc);
void exit_io_context(struct task_struct *task);
struct io_context *get_io_context(gfp_t gfp_flags, int node);
struct io_context *alloc_io_context(gfp_t gfp_flags, int node);
+void copy_io_context(struct io_context **pdst, struct io_context **psrc);
#else
static inline void exit_io_context(struct task_struct *task)
{
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index f512e18..a8a7cf0 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -49,6 +49,8 @@ extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
* (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
*/

+extern void __init_mem_page_cgroup(struct page_cgroup *pc);
+
extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask);
/* for swap handling */
@@ -153,6 +155,10 @@ void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail);
#else /* CONFIG_CGROUP_MEM_RES_CTLR */
struct mem_cgroup;

+static inline void __init_mem_page_cgroup(struct page_cgroup *pc)
+{
+}
+
static inline int mem_cgroup_newpage_charge(struct page *page,
struct mm_struct *mm, gfp_t gfp_mask)
{
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 02ecb01..a04c37a 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -615,7 +615,7 @@ typedef struct pglist_data {
int nr_zones;
#ifdef CONFIG_FLAT_NODE_MEM_MAP /* means !SPARSEMEM */
struct page *node_mem_map;
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+#ifdef CONFIG_CGROUP_PAGE
struct page_cgroup *node_page_cgroup;
#endif
#endif
@@ -975,7 +975,7 @@ struct mem_section {

/* See declaration of similar field in struct zone */
unsigned long *pageblock_flags;
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+#ifdef CONFIG_CGROUP_PAGE
/*
* If !SPARSEMEM, pgdat doesn't have page_cgroup pointer. We use
* section. (see memcontrol.h/page_cgroup.h about this.)
diff --git a/include/linux/page_cgroup.h b/include/linux/page_cgroup.h
index 6d6cb7a..c3e66fd 100644
--- a/include/linux/page_cgroup.h
+++ b/include/linux/page_cgroup.h
@@ -1,7 +1,7 @@
#ifndef __LINUX_PAGE_CGROUP_H
#define __LINUX_PAGE_CGROUP_H

-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+#ifdef CONFIG_CGROUP_PAGE
#include <linux/bit_spinlock.h>
/*
* Page Cgroup can be considered as an extended mem_map.
@@ -11,10 +11,15 @@
* then the page cgroup for pfn always exists.
*/
struct page_cgroup {
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
unsigned long flags;
struct mem_cgroup *mem_cgroup;
struct page *page;
struct list_head lru; /* per cgroup LRU list */
+#endif
+#ifdef CONFIG_CGROUP_BLKIOTRACK
+ unsigned long blkio_cgroup_id;
+#endif
};

void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat);
@@ -33,6 +38,8 @@ static inline void __init page_cgroup_init(void)

struct page_cgroup *lookup_page_cgroup(struct page *page);

+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+
enum {
/* flags for mem_cgroup */
PCG_LOCK, /* Lock for pc->mem_cgroup and following bits. */
@@ -131,8 +138,9 @@ static inline void move_unlock_page_cgroup(struct page_cgroup *pc,
bit_spin_unlock(PCG_MOVE_LOCK, &pc->flags);
local_irq_restore(*flags);
}
+#endif

-#else /* CONFIG_CGROUP_MEM_RES_CTLR */
+#else /* CONFIG_CGROUP_PAGE */
struct page_cgroup;

static inline void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
diff --git a/init/Kconfig b/init/Kconfig
index be788c0..256041f 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -742,6 +742,22 @@ config DEBUG_BLK_CGROUP
Enable some debugging help. Currently it exports additional stat
files in a cgroup which can be useful for debugging.

+config CGROUP_BLKIOTRACK
+ bool
+ depends on CGROUPS && BLOCK
+ select MM_OWNER
+ default n
+ ---help---
+ Provides a Resource Controller which enables to track the onwner
+ of every Block I/O requests.
+ The information this subsystem provides can be used from any
+ kind of module such as dm-ioband device mapper modules or
+ the cfq-scheduler.
+
+config CGROUP_PAGE
+ def_bool y
+ depends on CGROUP_MEM_RES_CTLR || CGROUP_BLKIOTRACK
+
endif # CGROUPS

menuconfig NAMESPACES
diff --git a/mm/Makefile b/mm/Makefile
index 2b1b575..7da3bc8 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -38,7 +38,8 @@ obj-$(CONFIG_FS_XIP) += filemap_xip.o
obj-$(CONFIG_MIGRATION) += migrate.o
obj-$(CONFIG_QUICKLIST) += quicklist.o
obj-$(CONFIG_TRANSPARENT_HUGEPAGE) += huge_memory.o
-obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o
+obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o
+obj-$(CONFIG_CGROUP_PAGE) += page_cgroup.o
obj-$(CONFIG_MEMORY_FAILURE) += memory-failure.o
obj-$(CONFIG_HWPOISON_INJECT) += hwpoison-inject.o
obj-$(CONFIG_DEBUG_KMEMLEAK) += kmemleak.o
diff --git a/mm/bounce.c b/mm/bounce.c
index 1481de6..64980fb 100644
--- a/mm/bounce.c
+++ b/mm/bounce.c
@@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/hash.h>
#include <linux/highmem.h>
+#include <linux/blkio-track.h>
#include <asm/tlbflush.h>

#include <trace/events/block.h>
@@ -211,6 +212,7 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
to->bv_len = from->bv_len;
to->bv_offset = from->bv_offset;
inc_zone_page_state(to->bv_page, NR_BOUNCE);
+ blkio_cgroup_copy_owner(to->bv_page, page);

if (rw == WRITE) {
char *vto, *vfrom;
diff --git a/mm/filemap.c b/mm/filemap.c
index 83a45d3..ab9b53a 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -33,6 +33,7 @@
#include <linux/cpuset.h>
#include <linux/hardirq.h> /* for BUG_ON(!in_atomic()) only */
#include <linux/memcontrol.h>
+#include <linux/blkio-track.h>
#include <linux/mm_inline.h> /* for page_is_file_cache() */
#include "internal.h"

@@ -407,6 +408,7 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
gfp_mask & GFP_RECLAIM_MASK);
if (error)
goto out;
+ blkio_cgroup_set_owner(page, current->mm);

error = radix_tree_preload(gfp_mask & ~__GFP_HIGHMEM);
if (error == 0) {
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index da53a25..e11c2cd 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -359,6 +359,12 @@ static void mem_cgroup_put(struct mem_cgroup *mem);
static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
static void drain_all_stock_async(void);

+void __meminit __init_mem_page_cgroup(struct page_cgroup *pc)
+{
+ pc->mem_cgroup = NULL;
+ INIT_LIST_HEAD(&pc->lru);
+}
+
static struct mem_cgroup_per_zone *
mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid)
{
diff --git a/mm/memory.c b/mm/memory.c
index 31250fa..4735c3c 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -52,6 +52,7 @@
#include <linux/init.h>
#include <linux/writeback.h>
#include <linux/memcontrol.h>
+#include <linux/blkio-track.h>
#include <linux/mmu_notifier.h>
#include <linux/kallsyms.h>
#include <linux/swapops.h>
@@ -2403,6 +2404,7 @@ gotten:
*/
ptep_clear_flush(vma, address, page_table);
page_add_new_anon_rmap(new_page, vma, address);
+ blkio_cgroup_set_owner(new_page, mm);
/*
* We call the notify macro here because, when using secondary
* mmu page tables (such as kvm shadow page tables), we want the
@@ -2828,6 +2830,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
flush_icache_page(vma, page);
set_pte_at(mm, address, page_table, pte);
do_page_add_anon_rmap(page, vma, address, exclusive);
+ blkio_cgroup_reset_owner(page, mm);
/* It's better to call commit-charge after rmap is established */
mem_cgroup_commit_charge_swapin(page, ptr);

@@ -2959,6 +2962,8 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,

inc_mm_counter_fast(mm, MM_ANONPAGES);
page_add_new_anon_rmap(page, vma, address);
+ /* Not setting the owner for special pages */
+ blkio_cgroup_set_owner(page, mm);
setpte:
set_pte_at(mm, address, page_table, entry);

@@ -3114,6 +3119,7 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
if (anon) {
inc_mm_counter_fast(mm, MM_ANONPAGES);
page_add_new_anon_rmap(page, vma, address);
+ blkio_cgroup_set_owner(page, mm);
} else {
inc_mm_counter_fast(mm, MM_FILEPAGES);
page_add_file_rmap(page);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 2cb01f6..b2a8f81 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -23,6 +23,7 @@
#include <linux/init.h>
#include <linux/backing-dev.h>
#include <linux/task_io_accounting_ops.h>
+#include <linux/blkio-track.h>
#include <linux/blkdev.h>
#include <linux/mpage.h>
#include <linux/rmap.h>
@@ -1153,7 +1154,8 @@ EXPORT_SYMBOL(account_page_writeback);
* We take care to handle the case where the page was truncated from the
* mapping by re-checking page_mapping() inside tree_lock.
*/
-int __set_page_dirty_nobuffers(struct page *page)
+int __set_page_dirty_nobuffers_track_owner(struct page *page,
+ int update_owner)
{
if (!TestSetPageDirty(page)) {
struct address_space *mapping = page_mapping(page);
@@ -1168,6 +1170,9 @@ int __set_page_dirty_nobuffers(struct page *page)
BUG_ON(mapping2 != mapping);
WARN_ON_ONCE(!PagePrivate(page) && !PageUptodate(page));
account_page_dirtied(page, mapping);
+ if (update_owner)
+ blkio_cgroup_reset_owner_pagedirty(page,
+ current->mm);
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
}
@@ -1180,6 +1185,11 @@ int __set_page_dirty_nobuffers(struct page *page)
}
return 0;
}
+
+int __set_page_dirty_nobuffers(struct page *page)
+{
+ return __set_page_dirty_nobuffers_track_owner(page, 1);
+}
EXPORT_SYMBOL(__set_page_dirty_nobuffers);

/*
@@ -1190,7 +1200,7 @@ EXPORT_SYMBOL(__set_page_dirty_nobuffers);
int redirty_page_for_writepage(struct writeback_control *wbc, struct page *page)
{
wbc->pages_skipped++;
- return __set_page_dirty_nobuffers(page);
+ return __set_page_dirty_nobuffers_track_owner(page, 0);
}
EXPORT_SYMBOL(redirty_page_for_writepage);

diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index 5bffada..78f5425 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -10,14 +10,17 @@
#include <linux/cgroup.h>
#include <linux/swapops.h>
#include <linux/kmemleak.h>
+#include <linux/blkio-track.h>

static void __meminit
__init_page_cgroup(struct page_cgroup *pc, unsigned long pfn)
{
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
pc->flags = 0;
- pc->mem_cgroup = NULL;
pc->page = pfn_to_page(pfn);
- INIT_LIST_HEAD(&pc->lru);
+#endif
+ __init_mem_page_cgroup(pc);
+ __init_blkio_page_cgroup(pc);
}
static unsigned long total_usage;

@@ -75,7 +78,7 @@ void __init page_cgroup_init_flatmem(void)

int nid, fail;

- if (mem_cgroup_disabled())
+ if (mem_cgroup_disabled() && blkio_cgroup_disabled())
return;

for_each_online_node(nid) {
@@ -84,12 +87,13 @@ void __init page_cgroup_init_flatmem(void)
goto fail;
}
printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
- printk(KERN_INFO "please try 'cgroup_disable=memory' option if you"
- " don't want memory cgroups\n");
+ printk(KERN_INFO "please try 'cgroup_disable=memory,blkio' option"
+ " if you don't want memory and blkio cgroups\n");
return;
fail:
printk(KERN_CRIT "allocation of page_cgroup failed.\n");
- printk(KERN_CRIT "please try 'cgroup_disable=memory' boot option\n");
+ printk(KERN_CRIT
+ "please try 'cgroup_disable=memory,blkio' boot option\n");
panic("Out of memory");
}

@@ -134,6 +138,7 @@ static int __init_refok init_section_page_cgroup(unsigned long pfn)
*/
kmemleak_not_leak(base);
} else {
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
/*
* We don't have to allocate page_cgroup again, but
* address of memmap may be changed. So, we have to initialize
@@ -144,6 +149,9 @@ static int __init_refok init_section_page_cgroup(unsigned long pfn)
/* check address of memmap is changed or not. */
if (base->page == pfn_to_page(pfn))
return 0;
+#else
+ return 0;
+#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
}

if (!base) {
@@ -258,7 +266,7 @@ void __init page_cgroup_init(void)
unsigned long pfn;
int fail = 0;

- if (mem_cgroup_disabled())
+ if (mem_cgroup_disabled() && blkio_cgroup_disabled())
return;

for (pfn = 0; !fail && pfn < max_pfn; pfn += PAGES_PER_SECTION) {
@@ -267,14 +275,15 @@ void __init page_cgroup_init(void)
fail = init_section_page_cgroup(pfn);
}
if (fail) {
- printk(KERN_CRIT "try 'cgroup_disable=memory' boot option\n");
+ printk(KERN_CRIT
+ "try 'cgroup_disable=memory,blkio' boot option\n");
panic("Out of memory");
} else {
hotplug_memory_notifier(page_cgroup_callback, 0);
}
printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
- printk(KERN_INFO "please try 'cgroup_disable=memory' option if you don't"
- " want memory cgroups\n");
+ printk(KERN_INFO "please try 'cgroup_disable=memory,blkio' option"
+ " if you don't want memory and blkio cgroups\n");
}

void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
diff --git a/mm/swap_state.c b/mm/swap_state.c
index 5c8cfab..bd4c4e7 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -19,6 +19,7 @@
#include <linux/pagevec.h>
#include <linux/migrate.h>
#include <linux/page_cgroup.h>
+#include <linux/blkio-track.h>

#include <asm/pgtable.h>

@@ -330,6 +331,7 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
/* May fail (-ENOMEM) if radix-tree node allocation failed. */
__set_page_locked(new_page);
SetPageSwapBacked(new_page);
+ blkio_cgroup_set_owner(new_page, current->mm);
err = __add_to_swap_cache(new_page, entry);
if (likely(!err)) {
radix_tree_preload_end();
--
1.7.3.1


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