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authorJan Kara <jack@suse.cz>2021-09-03 00:53:06 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-03 19:58:10 +0300
commitfee468fdf41cdf36ba6b5a780e2474d0a3e066ac (patch)
tree701fd0b0ab22a1b8d13996ced2bc161aee27631b /include/linux/backing-dev.h
parent633a2abb9e1cd5c95f3b600f4b2c12cce22ae4a0 (diff)
downloadlinux-fee468fdf41cdf36ba6b5a780e2474d0a3e066ac.tar.xz
writeback: reliably update bandwidth estimation
Currently we trigger writeback bandwidth estimation from balance_dirty_pages() and from wb_writeback(). However neither of these need to trigger when the system is relatively idle and writeback is triggered e.g. from fsync(2). Make sure writeback estimates happen reliably by triggering them from do_writepages(). Link: https://lkml.kernel.org/r/20210713104716.22868-2-jack@suse.cz Signed-off-by: Jan Kara <jack@suse.cz> Cc: Michael Stapelberg <stapelberg+linux@google.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/backing-dev.h')
-rw-r--r--include/linux/backing-dev.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 44df4fcef65c..8a886bca51e5 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -288,6 +288,17 @@ static inline struct bdi_writeback *inode_to_wb(const struct inode *inode)
return inode->i_wb;
}
+static inline struct bdi_writeback *inode_to_wb_wbc(
+ struct inode *inode,
+ struct writeback_control *wbc)
+{
+ /*
+ * If wbc does not have inode attached, it means cgroup writeback was
+ * disabled when wbc started. Just use the default wb in that case.
+ */
+ return wbc->wb ? wbc->wb : &inode_to_bdi(inode)->wb;
+}
+
/**
* unlocked_inode_to_wb_begin - begin unlocked inode wb access transaction
* @inode: target inode
@@ -366,6 +377,14 @@ static inline struct bdi_writeback *inode_to_wb(struct inode *inode)
return &inode_to_bdi(inode)->wb;
}
+static inline struct bdi_writeback *inode_to_wb_wbc(
+ struct inode *inode,
+ struct writeback_control *wbc)
+{
+ return inode_to_wb(inode);
+}
+
+
static inline struct bdi_writeback *
unlocked_inode_to_wb_begin(struct inode *inode, struct wb_lock_cookie *cookie)
{