linux-kernel - [PATCH v1 0/2] Tiny optimization for large read operations

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Message-ID: <20250728083952.75518-1-chizhiling@163.com>
Date: Mon, 28 Jul 2025 16:39:50 +0800
From: Chi Zhiling <chizhiling@....com>
To: willy@...radead.org,
	akpm@...ux-foundation.org
Cc: linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Chi Zhiling <chizhiling@...inos.cn>
Subject: [PATCH v1 0/2] Tiny optimization for large read operations

From: Chi Zhiling <chizhiling@...inos.cn>

This series contains two patches,

1. Skip calling is_partially_uptodate for entire folio to save time,
I have reviewed the mpage and iomap implementations and didn't spot any
issues, but this change likely needs more thorough review.

2. Skip calling filemap_uptodate if there are ready folios in the batch,
This might save a few milliseconds in practice, but I didn't observe
measurable improvements in my tests.

Changes from rfc:
- update commits
- switch to the new solution which provided by Matthew Wilcox.

rfc:
https://lore.kernel.org/linux-fsdevel/20250723101825.607184-1-chizhiling@163.com/

Chi Zhiling (2):
  mm/filemap: Do not use is_partially_uptodate for entire folio
  mm/filemap: Skip non-uptodate folio if there are available folios

 mm/filemap.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

-- 
2.43.0