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Subject[PATCH 2/2] memcg: dirty pages instrumentation
Date
Apply the cgroup dirty pages accounting and limiting infrastructure to
the opportune kernel functions.

Signed-off-by: Andrea Righi <arighi@develer.com>
---
fs/fuse/file.c | 3 ++
fs/nfs/write.c | 3 ++
fs/nilfs2/segment.c | 8 ++++-
mm/filemap.c | 1 +
mm/page-writeback.c | 69 ++++++++++++++++++++++++++++++++++++--------------
mm/truncate.c | 1 +
6 files changed, 63 insertions(+), 22 deletions(-)
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index a9f5e13..357632a 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 +1130,7 @@ 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_charge_dirty(req->pages[0], NR_WRITEBACK_TEMP, -1);
dec_zone_page_state(req->pages[0], NR_WRITEBACK_TEMP);
bdi_writeout_inc(bdi);
wake_up(&fi->page_waitq);
@@ -1240,6 +1242,7 @@ static int fuse_writepage_locked(struct page *page)
req->inode = inode;

inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK);
+ mem_cgroup_charge_dirty(tmp_page, NR_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 d63d964..3d9de01 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_charge_dirty(req->wb_page, NR_UNSTABLE_NFS, 1);
inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE);
__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_charge_dirty(page, NR_UNSTABLE_NFS, -1);
dec_zone_page_state(page, NR_UNSTABLE_NFS);
dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE);
return 1;
@@ -1320,6 +1322,7 @@ 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_charge_dirty(req->wb_page, NR_UNSTABLE_NFS, -1);
dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
dec_bdi_stat(req->wb_page->mapping->backing_dev_info,
BDI_RECLAIMABLE);
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 105b508..b9ffac5 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1660,8 +1660,10 @@ 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_charge_dirty(clone_page, NR_WRITEBACK, 1);
inc_zone_page_state(clone_page, NR_WRITEBACK);
+ }
unlock_page(clone_page);

return 0;
@@ -1788,8 +1790,10 @@ static void __nilfs_end_page_io(struct page *page, int err)
}

if (buffer_nilfs_allocated(page_buffers(page))) {
- if (TestClearPageWriteback(page))
+ if (TestClearPageWriteback(page)) {
+ mem_cgroup_charge_dirty(clone_page, NR_WRITEBACK, -1);
dec_zone_page_state(page, NR_WRITEBACK);
+ }
} else
end_page_writeback(page);
}
diff --git a/mm/filemap.c b/mm/filemap.c
index 698ea80..c19d809 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -135,6 +135,7 @@ void __remove_from_page_cache(struct page *page)
* having removed the page entirely.
*/
if (PageDirty(page) && mapping_cap_account_dirty(mapping)) {
+ mem_cgroup_charge_dirty(page, NR_FILE_DIRTY, -1);
dec_zone_page_state(page, NR_FILE_DIRTY);
dec_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE);
}
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0b19943..c9ff1cd 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -137,10 +137,11 @@ static struct prop_descriptor vm_dirties;
*/
static int calc_period_shift(void)
{
- unsigned long dirty_total;
+ unsigned long dirty_total, dirty_bytes;

- if (vm_dirty_bytes)
- dirty_total = vm_dirty_bytes / PAGE_SIZE;
+ dirty_bytes = mem_cgroup_dirty_bytes();
+ if (dirty_bytes)
+ dirty_total = dirty_bytes / PAGE_SIZE;
else
dirty_total = (vm_dirty_ratio * determine_dirtyable_memory()) /
100;
@@ -406,14 +407,20 @@ static unsigned long highmem_dirtyable_memory(unsigned long total)
*/
unsigned long determine_dirtyable_memory(void)
{
- unsigned long x;
-
- x = global_page_state(NR_FREE_PAGES) + global_reclaimable_pages();
-
+ unsigned long memcg_memory, memory;
+
+ memory = global_page_state(NR_FREE_PAGES) + global_reclaimable_pages();
+ memcg_memory = mem_cgroup_page_state(MEMCG_NR_FREE_PAGES);
+ if (memcg_memory > 0) {
+ memcg_memory +=
+ mem_cgroup_page_state(MEMCG_NR_RECLAIMABLE_PAGES);
+ if (memcg_memory < memory)
+ return memcg_memory;
+ }
if (!vm_highmem_is_dirtyable)
- x -= highmem_dirtyable_memory(x);
+ memory -= highmem_dirtyable_memory(memory);

- return x + 1; /* Ensure that we never return 0 */
+ return memory + 1; /* Ensure that we never return 0 */
}

void
@@ -421,12 +428,13 @@ get_dirty_limits(unsigned long *pbackground, unsigned long *pdirty,
unsigned long *pbdi_dirty, struct backing_dev_info *bdi)
{
unsigned long background;
- unsigned long dirty;
+ unsigned long dirty, dirty_bytes;
unsigned long available_memory = determine_dirtyable_memory();
struct task_struct *tsk;

- if (vm_dirty_bytes)
- dirty = DIV_ROUND_UP(vm_dirty_bytes, PAGE_SIZE);
+ dirty_bytes = mem_cgroup_dirty_bytes();
+ if (dirty_bytes)
+ dirty = DIV_ROUND_UP(dirty_bytes, PAGE_SIZE);
else {
int dirty_ratio;

@@ -505,9 +513,17 @@ static void balance_dirty_pages(struct address_space *mapping,
get_dirty_limits(&background_thresh, &dirty_thresh,
&bdi_thresh, bdi);

- nr_reclaimable = global_page_state(NR_FILE_DIRTY) +
+ nr_reclaimable = mem_cgroup_page_state(MEMCG_NR_FILE_DIRTY);
+ if (nr_reclaimable == 0) {
+ nr_reclaimable = global_page_state(NR_FILE_DIRTY) +
global_page_state(NR_UNSTABLE_NFS);
- nr_writeback = global_page_state(NR_WRITEBACK);
+ nr_writeback = global_page_state(NR_WRITEBACK);
+ } else {
+ nr_reclaimable +=
+ mem_cgroup_page_state(MEMCG_NR_UNSTABLE_NFS);
+ nr_writeback =
+ mem_cgroup_page_state(MEMCG_NR_WRITEBACK);
+ }

bdi_nr_reclaimable = bdi_stat(bdi, BDI_RECLAIMABLE);
bdi_nr_writeback = bdi_stat(bdi, BDI_WRITEBACK);
@@ -660,6 +676,8 @@ void throttle_vm_writeout(gfp_t gfp_mask)
unsigned long dirty_thresh;

for ( ; ; ) {
+ unsigned long dirty;
+
get_dirty_limits(&background_thresh, &dirty_thresh, NULL, NULL);

/*
@@ -668,10 +686,15 @@ void throttle_vm_writeout(gfp_t gfp_mask)
*/
dirty_thresh += dirty_thresh / 10; /* wheeee... */

- if (global_page_state(NR_UNSTABLE_NFS) +
- global_page_state(NR_WRITEBACK) <= dirty_thresh)
- break;
- congestion_wait(BLK_RW_ASYNC, HZ/10);
+ dirty = mem_cgroup_page_state(MEMCG_NR_WRITEBACK);
+ if (dirty < 0)
+ dirty = global_page_state(NR_UNSTABLE_NFS) +
+ global_page_state(NR_WRITEBACK);
+ else
+ dirty += mem_cgroup_page_state(MEMCG_NR_UNSTABLE_NFS);
+ if (dirty <= dirty_thresh)
+ break;
+ congestion_wait(BLK_RW_ASYNC, HZ/10);

/*
* The caller might hold locks which can prevent IO completion
@@ -1078,6 +1101,7 @@ int __set_page_dirty_no_writeback(struct page *page)
void account_page_dirtied(struct page *page, struct address_space *mapping)
{
if (mapping_cap_account_dirty(mapping)) {
+ mem_cgroup_charge_dirty(page, NR_FILE_DIRTY, 1);
__inc_zone_page_state(page, NR_FILE_DIRTY);
__inc_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE);
task_dirty_inc(current);
@@ -1253,6 +1277,7 @@ int clear_page_dirty_for_io(struct page *page)
* for more comments.
*/
if (TestClearPageDirty(page)) {
+ mem_cgroup_charge_dirty(page, NR_FILE_DIRTY, -1);
dec_zone_page_state(page, NR_FILE_DIRTY);
dec_bdi_stat(mapping->backing_dev_info,
BDI_RECLAIMABLE);
@@ -1288,8 +1313,10 @@ int test_clear_page_writeback(struct page *page)
} else {
ret = TestClearPageWriteback(page);
}
- if (ret)
+ if (ret) {
+ mem_cgroup_charge_dirty(page, NR_WRITEBACK, -1);
dec_zone_page_state(page, NR_WRITEBACK);
+ }
return ret;
}

@@ -1319,8 +1346,10 @@ int test_set_page_writeback(struct page *page)
} else {
ret = TestSetPageWriteback(page);
}
- if (!ret)
+ if (!ret) {
+ mem_cgroup_charge_dirty(page, NR_WRITEBACK, 1);
inc_zone_page_state(page, NR_WRITEBACK);
+ }
return ret;

}
diff --git a/mm/truncate.c b/mm/truncate.c
index e87e372..f44e370 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -73,6 +73,7 @@ void cancel_dirty_page(struct page *page, unsigned int account_size)
if (TestClearPageDirty(page)) {
struct address_space *mapping = page->mapping;
if (mapping && mapping_cap_account_dirty(mapping)) {
+ mem_cgroup_charge_dirty(page, NR_FILE_DIRTY, -1);
dec_zone_page_state(page, NR_FILE_DIRTY);
dec_bdi_stat(mapping->backing_dev_info,
BDI_RECLAIMABLE);
--
1.6.3.3


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