linux-kernel - [PATCHv2 0/4] zram: introduce writeback bio batching

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Message-ID: <20251113085402.1811522-1-senozhatsky@chromium.org>
Date: Thu, 13 Nov 2025 17:53:58 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>,
	Yuwen Chen <ywen.chen@...mail.com>,
	Richard Chang <richardycc@...gle.com>
Cc: Brian Geffon <bgeffon@...gle.com>,
	Fengyu Lian <licayy@...look.com>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-block@...r.kernel.org,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCHv2 0/4] zram: introduce writeback bio batching

This is a rework of Yuwen's patch [1] that adds writeback bio
batching support to zram, which can improve throughput of
writeback operation.

v1->v2:
- moved pp-slot ownership to req before submission (pp_ctl doesn't own it
  anymore after it's assigned to the req)
- do not take spin-lock in bach_limit handler
- dropped wb_limit_lock
- moved wb_limt accounting to pre-submit and completion stages
- introduced simple wb_limit helpers
- more comments and cleanups

[1] https://lore.kernel.org/linux-block/tencent_0FBBFC8AE0B97BC63B5D47CE1FF2BABFDA09@qq.com/

Sergey Senozhatsky (3):
  zram: add writeback batch size device attr
  zram: take write lock in wb limit store handlers
  zram: drop wb_limit_lock

Yuwen Chen (1):
  zram: introduce writeback bio batching support

 drivers/block/zram/zram_drv.c | 410 +++++++++++++++++++++++++++-------
 drivers/block/zram/zram_drv.h |   2 +-
 2 files changed, 326 insertions(+), 86 deletions(-)

-- 
2.51.2.1041.gc1ab5b90ca-goog