lkml.org 
[lkml]   [2010]   [Mar]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH -mmotm 5/5] memcg: dirty pages instrumentation
Date
Apply the cgroup dirty pages accounting and limiting infrastructure to
the opportune kernel functions.

[ NOTE: for now do not account WritebackTmp pages (FUSE) and NILFS2
bounce pages. This depends on charging also bounce pages per cgroup. ]

As a bonus, make determine_dirtyable_memory() static again: this
function isn't used anymore outside page writeback.

Signed-off-by: Andrea Righi <arighi@develer.com>
---
fs/nfs/write.c | 4 +
include/linux/writeback.h | 2 -
mm/filemap.c | 1 +
mm/page-writeback.c | 215 ++++++++++++++++++++++++++++-----------------
mm/rmap.c | 4 +-
mm/truncate.c | 1 +
6 files changed, 141 insertions(+), 86 deletions(-)
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 53ff70e..3e8b9f8 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -440,6 +440,7 @@ nfs_mark_request_commit(struct nfs_page *req)
NFS_PAGE_TAG_COMMIT);
nfsi->ncommit++;
spin_unlock(&inode->i_lock);
+ mem_cgroup_inc_page_stat(req->wb_page, MEMCG_NR_FILE_UNSTABLE_NFS);
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);
@@ -451,6 +452,7 @@ 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_dec_page_stat(page, MEMCG_NR_FILE_UNSTABLE_NFS);
dec_zone_page_state(page, NR_UNSTABLE_NFS);
dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE);
return 1;
@@ -1277,6 +1279,8 @@ 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_dec_page_stat(req->wb_page,
+ MEMCG_NR_FILE_UNSTABLE_NFS);
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/include/linux/writeback.h b/include/linux/writeback.h
index dd9512d..39e4cb2 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -117,8 +117,6 @@ extern int vm_highmem_is_dirtyable;
extern int block_dump;
extern int laptop_mode;

-extern unsigned long determine_dirtyable_memory(void);
-
extern int dirty_background_ratio_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos);
diff --git a/mm/filemap.c b/mm/filemap.c
index 62cbac0..bd833fe 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_dec_page_stat(page, MEMCG_NR_FILE_DIRTY);
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 ab84693..fcac9b4 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -131,6 +131,111 @@ static struct prop_descriptor vm_completions;
static struct prop_descriptor vm_dirties;

/*
+ * Work out the current dirty-memory clamping and background writeout
+ * thresholds.
+ *
+ * The main aim here is to lower them aggressively if there is a lot of mapped
+ * memory around. To avoid stressing page reclaim with lots of unreclaimable
+ * pages. It is better to clamp down on writers than to start swapping, and
+ * performing lots of scanning.
+ *
+ * We only allow 1/2 of the currently-unmapped memory to be dirtied.
+ *
+ * We don't permit the clamping level to fall below 5% - that is getting rather
+ * excessive.
+ *
+ * We make sure that the background writeout level is below the adjusted
+ * clamping level.
+ */
+
+static unsigned long highmem_dirtyable_memory(unsigned long total)
+{
+#ifdef CONFIG_HIGHMEM
+ int node;
+ unsigned long x = 0;
+
+ for_each_node_state(node, N_HIGH_MEMORY) {
+ struct zone *z =
+ &NODE_DATA(node)->node_zones[ZONE_HIGHMEM];
+
+ x += zone_page_state(z, NR_FREE_PAGES) +
+ zone_reclaimable_pages(z);
+ }
+ /*
+ * Make sure that the number of highmem pages is never larger
+ * than the number of the total dirtyable memory. This can only
+ * occur in very strange VM situations but we want to make sure
+ * that this does not occur.
+ */
+ return min(x, total);
+#else
+ return 0;
+#endif
+}
+
+static unsigned long get_global_dirtyable_memory(void)
+{
+ unsigned long memory;
+
+ memory = global_page_state(NR_FREE_PAGES) + global_reclaimable_pages();
+ if (!vm_highmem_is_dirtyable)
+ memory -= highmem_dirtyable_memory(memory);
+ return memory + 1;
+}
+
+static unsigned long get_dirtyable_memory(void)
+{
+ unsigned long memory;
+ s64 memcg_memory;
+
+ memory = get_global_dirtyable_memory();
+ if (!mem_cgroup_has_dirty_limit())
+ return memory;
+ memcg_memory = mem_cgroup_page_stat(MEMCG_NR_DIRTYABLE_PAGES);
+ BUG_ON(memcg_memory < 0);
+
+ return min((unsigned long)memcg_memory, memory);
+}
+
+static long get_reclaimable_pages(void)
+{
+ s64 ret;
+
+ if (!mem_cgroup_has_dirty_limit())
+ return global_page_state(NR_FILE_DIRTY) +
+ global_page_state(NR_UNSTABLE_NFS);
+ ret = mem_cgroup_page_stat(MEMCG_NR_RECLAIM_PAGES);
+ BUG_ON(ret < 0);
+
+ return ret;
+}
+
+static long get_writeback_pages(void)
+{
+ s64 ret;
+
+ if (!mem_cgroup_has_dirty_limit())
+ return global_page_state(NR_WRITEBACK);
+ ret = mem_cgroup_page_stat(MEMCG_NR_WRITEBACK);
+ BUG_ON(ret < 0);
+
+ return ret;
+}
+
+static unsigned long get_dirty_writeback_pages(void)
+{
+ s64 ret;
+
+ if (!mem_cgroup_has_dirty_limit())
+ return global_page_state(NR_UNSTABLE_NFS) +
+ global_page_state(NR_WRITEBACK);
+ ret = mem_cgroup_page_stat(MEMCG_NR_DIRTY_WRITEBACK_PAGES);
+ BUG_ON(ret < 0);
+
+ return ret;
+}
+
+/*
* couple the period to the dirty_ratio:
*
* period/2 ~ roundup_pow_of_two(dirty limit)
@@ -142,7 +247,7 @@ static int calc_period_shift(void)
if (vm_dirty_bytes)
dirty_total = vm_dirty_bytes / PAGE_SIZE;
else
- dirty_total = (vm_dirty_ratio * determine_dirtyable_memory()) /
+ dirty_total = (vm_dirty_ratio * get_global_dirtyable_memory()) /
100;
return 2 + ilog2(dirty_total - 1);
}
@@ -355,92 +460,34 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned max_ratio)
}
EXPORT_SYMBOL(bdi_set_max_ratio);

-/*
- * Work out the current dirty-memory clamping and background writeout
- * thresholds.
- *
- * The main aim here is to lower them aggressively if there is a lot of mapped
- * memory around. To avoid stressing page reclaim with lots of unreclaimable
- * pages. It is better to clamp down on writers than to start swapping, and
- * performing lots of scanning.
- *
- * We only allow 1/2 of the currently-unmapped memory to be dirtied.
- *
- * We don't permit the clamping level to fall below 5% - that is getting rather
- * excessive.
- *
- * We make sure that the background writeout level is below the adjusted
- * clamping level.
- */
-
-static unsigned long highmem_dirtyable_memory(unsigned long total)
-{
-#ifdef CONFIG_HIGHMEM
- int node;
- unsigned long x = 0;
-
- for_each_node_state(node, N_HIGH_MEMORY) {
- struct zone *z =
- &NODE_DATA(node)->node_zones[ZONE_HIGHMEM];
-
- x += zone_page_state(z, NR_FREE_PAGES) +
- zone_reclaimable_pages(z);
- }
- /*
- * Make sure that the number of highmem pages is never larger
- * than the number of the total dirtyable memory. This can only
- * occur in very strange VM situations but we want to make sure
- * that this does not occur.
- */
- return min(x, total);
-#else
- return 0;
-#endif
-}
-
-/**
- * determine_dirtyable_memory - amount of memory that may be used
- *
- * Returns the numebr of pages that can currently be freed and used
- * by the kernel for direct mappings.
- */
-unsigned long determine_dirtyable_memory(void)
-{
- unsigned long x;
-
- x = global_page_state(NR_FREE_PAGES) + global_reclaimable_pages();
-
- if (!vm_highmem_is_dirtyable)
- x -= highmem_dirtyable_memory(x);
-
- return x + 1; /* Ensure that we never return 0 */
-}
-
void
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 available_memory = determine_dirtyable_memory();
+ unsigned long dirty, background;
+ unsigned long available_memory = get_dirtyable_memory();
struct task_struct *tsk;
+ struct vm_dirty_param dirty_param;

- if (vm_dirty_bytes)
- dirty = DIV_ROUND_UP(vm_dirty_bytes, PAGE_SIZE);
+ get_vm_dirty_param(&dirty_param);
+
+ if (dirty_param.dirty_bytes)
+ dirty = DIV_ROUND_UP(dirty_param.dirty_bytes, PAGE_SIZE);
else {
int dirty_ratio;

- dirty_ratio = vm_dirty_ratio;
+ dirty_ratio = dirty_param.dirty_ratio;
if (dirty_ratio < 5)
dirty_ratio = 5;
dirty = (dirty_ratio * available_memory) / 100;
}

- if (dirty_background_bytes)
- background = DIV_ROUND_UP(dirty_background_bytes, PAGE_SIZE);
+ if (dirty_param.dirty_background_bytes)
+ background = DIV_ROUND_UP(dirty_param.dirty_background_bytes,
+ PAGE_SIZE);
else
- background = (dirty_background_ratio * available_memory) / 100;
-
+ background = (dirty_param.dirty_background_ratio *
+ available_memory) / 100;
if (background >= dirty)
background = dirty / 2;
tsk = current;
@@ -505,9 +552,8 @@ 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) +
- global_page_state(NR_UNSTABLE_NFS);
- nr_writeback = global_page_state(NR_WRITEBACK);
+ nr_reclaimable = get_reclaimable_pages();
+ nr_writeback = get_writeback_pages();

bdi_nr_reclaimable = bdi_stat(bdi, BDI_RECLAIMABLE);
bdi_nr_writeback = bdi_stat(bdi, BDI_WRITEBACK);
@@ -593,10 +639,9 @@ static void balance_dirty_pages(struct address_space *mapping,
* In normal mode, we start background writeout at the lower
* background_thresh, to keep the amount of dirty memory low.
*/
+ nr_reclaimable = get_reclaimable_pages();
if ((laptop_mode && pages_written) ||
- (!laptop_mode && ((global_page_state(NR_FILE_DIRTY)
- + global_page_state(NR_UNSTABLE_NFS))
- > background_thresh)))
+ (!laptop_mode && (nr_reclaimable > background_thresh)))
bdi_start_writeback(bdi, NULL, 0);
}

@@ -660,6 +705,8 @@ 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 +715,10 @@ 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 = get_dirty_writeback_pages();
+ if (dirty <= dirty_thresh)
+ break;
+ congestion_wait(BLK_RW_ASYNC, HZ/10);

/*
* The caller might hold locks which can prevent IO completion
@@ -1078,6 +1125,7 @@ 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_inc_page_stat(page, MEMCG_NR_FILE_DIRTY);
__inc_zone_page_state(page, NR_FILE_DIRTY);
__inc_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE);
task_dirty_inc(current);
@@ -1279,6 +1327,7 @@ int clear_page_dirty_for_io(struct page *page)
* for more comments.
*/
if (TestClearPageDirty(page)) {
+ mem_cgroup_dec_page_stat(page, MEMCG_NR_FILE_DIRTY);
dec_zone_page_state(page, NR_FILE_DIRTY);
dec_bdi_stat(mapping->backing_dev_info,
BDI_RECLAIMABLE);
@@ -1310,6 +1359,7 @@ int test_clear_page_writeback(struct page *page)
__bdi_writeout_inc(bdi);
}
}
+ mem_cgroup_dec_page_stat(page, MEMCG_NR_FILE_WRITEBACK);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
} else {
ret = TestClearPageWriteback(page);
@@ -1341,6 +1391,7 @@ int test_set_page_writeback(struct page *page)
radix_tree_tag_clear(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_DIRTY);
+ mem_cgroup_inc_page_stat(page, MEMCG_NR_FILE_WRITEBACK);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
} else {
ret = TestSetPageWriteback(page);
diff --git a/mm/rmap.c b/mm/rmap.c
index fcd593c..916a660 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -828,8 +828,8 @@ void page_add_new_anon_rmap(struct page *page,
void page_add_file_rmap(struct page *page)
{
if (atomic_inc_and_test(&page->_mapcount)) {
+ mem_cgroup_inc_page_stat(page, MEMCG_NR_FILE_MAPPED);
__inc_zone_page_state(page, NR_FILE_MAPPED);
- mem_cgroup_update_file_mapped(page, 1);
}
}

@@ -860,8 +860,8 @@ void page_remove_rmap(struct page *page)
mem_cgroup_uncharge_page(page);
__dec_zone_page_state(page, NR_ANON_PAGES);
} else {
+ mem_cgroup_dec_page_stat(page, MEMCG_NR_FILE_MAPPED);
__dec_zone_page_state(page, NR_FILE_MAPPED);
- mem_cgroup_update_file_mapped(page, -1);
}
/*
* It would be tidy to reset the PageAnon mapping here,
diff --git a/mm/truncate.c b/mm/truncate.c
index e87e372..83366da 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_dec_page_stat(page, MEMCG_NR_FILE_DIRTY);
dec_zone_page_state(page, NR_FILE_DIRTY);
dec_bdi_stat(mapping->backing_dev_info,
BDI_RECLAIMABLE);
--
1.6.3.3


\
 
 \ /
  Last update: 2010-03-10 00:05    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site