From: Stefan Roesch <[email protected]>
To: <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>
Cc: <[email protected]>, <[email protected]>, <[email protected]>
Subject: [RFC PATCH v2 13/16] mm: add balance_dirty_pages_ratelimited_flags() function
Date: Mon, 16 May 2022 09:47:15 -0700 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
This adds the function balance_dirty_pages_ratelimited_flags(). It adds
the parameter is_async to balance_dirty_pages_ratelimited(). In case
this is an async write, it will call _balance_diirty_pages() to
determine if write throttling needs to be enabled. If write throttling
is enabled, it retuns -EAGAIN, so the write request can be punted to
the io-uring worker.
The new function is changed to return the sleep time, so callers can
observe if the write has been punted.
For non-async writes the current behavior is maintained.
Signed-off-by: Stefan Roesch <[email protected]>
---
include/linux/writeback.h | 1 +
mm/page-writeback.c | 48 ++++++++++++++++++++++++++-------------
2 files changed, 33 insertions(+), 16 deletions(-)
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index fec248ab1fec..d589804bb3be 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -373,6 +373,7 @@ unsigned long wb_calc_thresh(struct bdi_writeback *wb, unsigned long thresh);
void wb_update_bandwidth(struct bdi_writeback *wb);
void balance_dirty_pages_ratelimited(struct address_space *mapping);
+int balance_dirty_pages_ratelimited_flags(struct address_space *mapping, bool is_async);
bool wb_over_bg_thresh(struct bdi_writeback *wb);
typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc,
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index cbb74c0666c6..78f1326f3f20 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1877,28 +1877,17 @@ static DEFINE_PER_CPU(int, bdp_ratelimits);
*/
DEFINE_PER_CPU(int, dirty_throttle_leaks) = 0;
-/**
- * balance_dirty_pages_ratelimited - balance dirty memory state
- * @mapping: address_space which was dirtied
- *
- * Processes which are dirtying memory should call in here once for each page
- * which was newly dirtied. The function will periodically check the system's
- * dirty state and will initiate writeback if needed.
- *
- * Once we're over the dirty memory limit we decrease the ratelimiting
- * by a lot, to prevent individual processes from overshooting the limit
- * by (ratelimit_pages) each.
- */
-void balance_dirty_pages_ratelimited(struct address_space *mapping)
+int balance_dirty_pages_ratelimited_flags(struct address_space *mapping, bool is_async)
{
struct inode *inode = mapping->host;
struct backing_dev_info *bdi = inode_to_bdi(inode);
struct bdi_writeback *wb = NULL;
int ratelimit;
+ int ret = 0;
int *p;
if (!(bdi->capabilities & BDI_CAP_WRITEBACK))
- return;
+ return ret;
if (inode_cgwb_enabled(inode))
wb = wb_get_create_current(bdi, GFP_KERNEL);
@@ -1937,10 +1926,37 @@ void balance_dirty_pages_ratelimited(struct address_space *mapping)
}
preempt_enable();
- if (unlikely(current->nr_dirtied >= ratelimit))
- balance_dirty_pages(wb, current->nr_dirtied);
+ if (unlikely(current->nr_dirtied >= ratelimit)) {
+ if (is_async) {
+ struct bdp_ctx ctx = { BDP_CTX_INIT(ctx, wb) };
+
+ ret = _balance_dirty_pages(wb, current->nr_dirtied, &ctx);
+ if (ret)
+ ret = -EAGAIN;
+ } else {
+ balance_dirty_pages(wb, current->nr_dirtied);
+ }
+ }
wb_put(wb);
+ return ret;
+}
+
+/**
+ * balance_dirty_pages_ratelimited - balance dirty memory state
+ * @mapping: address_space which was dirtied
+ *
+ * Processes which are dirtying memory should call in here once for each page
+ * which was newly dirtied. The function will periodically check the system's
+ * dirty state and will initiate writeback if needed.
+ *
+ * Once we're over the dirty memory limit we decrease the ratelimiting
+ * by a lot, to prevent individual processes from overshooting the limit
+ * by (ratelimit_pages) each.
+ */
+void balance_dirty_pages_ratelimited(struct address_space *mapping)
+{
+ balance_dirty_pages_ratelimited_flags(mapping, false);
}
EXPORT_SYMBOL(balance_dirty_pages_ratelimited);
--
2.30.2
next prev parent reply other threads:[~2022-05-16 16:49 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-16 16:47 [RFC PATCH v2 00/16] io-uring/xfs: support async buffered writes Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 01/16] block: add check for async buffered writes to generic_write_checks Stefan Roesch
2022-05-16 23:43 ` Matthew Wilcox
2022-05-18 23:20 ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 02/16] iomap: add iomap_page_create_gfp to allocate iomap_pages Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 03/16] iomap: use iomap_page_create_gfp() in __iomap_write_begin Stefan Roesch
2022-05-16 23:58 ` Matthew Wilcox
2022-05-18 23:21 ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 04/16] iomap: add async buffered write support Stefan Roesch
2022-05-17 11:14 ` Jan Kara
2022-05-18 23:19 ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 05/16] xfs: add iomap " Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 06/16] fs: split off need_remove_file_privs() do_remove_file_privs() Stefan Roesch
2022-05-17 13:18 ` Christian Brauner
2022-05-18 23:25 ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 07/16] fs: split off need_file_update_time and do_file_update_time Stefan Roesch
2022-05-17 11:20 ` Jan Kara
2022-05-18 23:21 ` Stefan Roesch
2022-05-17 13:40 ` Christian Brauner
2022-05-18 23:28 ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 08/16] fs: add pending file update time flag Stefan Roesch
2022-05-17 11:28 ` Jan Kara
2022-05-17 13:48 ` Christian Brauner
2022-05-18 23:23 ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 09/16] xfs: enable async write file modification handling Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 10/16] xfs: add async buffered write support Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 11/16] io_uring: add support for async buffered writes Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 12/16] mm: factor out _balance_dirty_pages() from balance_dirty_pages() Stefan Roesch
2022-05-18 11:07 ` Jan Kara
2022-05-18 23:31 ` Stefan Roesch
2022-05-16 16:47 ` Stefan Roesch [this message]
2022-05-17 20:12 ` [RFC PATCH v2 13/16] mm: add balance_dirty_pages_ratelimited_flags() function Jan Kara
2022-05-18 23:29 ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 14/16] iomap: use balance_dirty_pages_ratelimited_flags in iomap_write_iter Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 15/16] io_uring: add tracepoint for short writes Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 16/16] xfs: enable async buffered write support Stefan Roesch
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