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writeback: reliably update bandwidth estimation

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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>
This commit is contained in:
Jan Kara 2021-09-02 14:53:06 -07:00 • committed by Linus Torvalds
parent 633a2abb9e
commit fee468fdf4
4 changed files with 46 additions and 16 deletions
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19
include/linux/backing-dev.h
View file

@ -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)
{