linux-kernel - [PATCH v2 0/3] Fix calculations in trace_balance_dirty

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Message-Id: <20250304110318.159567-1-yizhou.tang@shopee.com>
Date: Tue,  4 Mar 2025 19:03:15 +0800
From: Tang Yizhou <yizhou.tang@...pee.com>
To: tj@...nel.org,
	jack@...e.cz,
	brauner@...nel.org,
	willy@...radead.org,
	akpm@...ux-foundation.org
Cc: rostedt@...dmis.org,
	mhiramat@...nel.org,
	ast@...nel.org,
	linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Tang Yizhou <yizhou.tang@...pee.com>
Subject: [PATCH v2 0/3] Fix calculations in trace_balance_dirty_pages() for cgwb

From: Tang Yizhou <yizhou.tang@...pee.com>

In my experiment, I found that the output of trace_balance_dirty_pages()
in the cgroup writeback scenario was strange because
trace_balance_dirty_pages() always uses global_wb_domain.dirty_limit for
related calculations instead of the dirty_limit of the corresponding
memcg's wb_domain.

The basic idea of the fix is to store the hard dirty limit value computed
in wb_position_ratio() into struct dirty_throttle_control and use it for
calculations in trace_balance_dirty_pages().

v2:
Adopt Tejun's suggestion and split the renaming code into Patch #2.
Pick up Tejun's Acked-by tag in Patch #3.

Tang Yizhou (3):
  writeback: Let trace_balance_dirty_pages() take struct dtc as
    parameter
  writeback: Rename variables in trace_balance_dirty_pages()
  writeback: Fix calculations in trace_balance_dirty_pages() for cgwb

 include/linux/writeback.h        | 24 +++++++++++++++++++++
 include/trace/events/writeback.h | 33 ++++++++++++----------------
 mm/page-writeback.c              | 37 +++-----------------------------
 3 files changed, 41 insertions(+), 53 deletions(-)

-- 
2.25.1