linux-kernel - [PATCH] mm/page-writeback: Update the comment of Dirty position control

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Message-Id: <20210511052626.19005-1-wuchi.zero@gmail.com>
Date:   Tue, 11 May 2021 13:26:26 +0800
From:   Chi Wu <wuchi.zero@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, tj@...nel.org,
        mszeredi@...hat.com, sedat.dilek@...il.com, axboe@...com,
        jack@...e.cz, hcochran@...nelspring.com,
        Chi Wu <wuchi.zero@...il.com>
Subject: [PATCH] mm/page-writeback: Update the comment of Dirty position control

As the value of pos_ratio_polynom() clamp between 0 and
2LL << RATELIMIT_CALC_SHIFT, the global control line should be
consistent with it.

Signed-off-by: Chi Wu <wuchi.zero@...il.com>
---
 mm/page-writeback.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0062d5c57d41..e9a4f6cf12bb 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -845,7 +845,7 @@ static long long pos_ratio_polynom(unsigned long setpoint,
  *     ^ pos_ratio
  *     |
  *     |            |<===== global dirty control scope ======>|
- * 2.0 .............*
+ * 2.0 * * * * * * *
  *     |            .*
  *     |            . *
  *     |            .   *
-- 
2.17.1