linux-kernel - [RESEND v8 0/2] mm: store zero pages to be swapped out in a bitmap

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Message-ID: <20240823190545.979059-1-usamaarif642@gmail.com>
Date: Fri, 23 Aug 2024 20:04:38 +0100
From: Usama Arif <usamaarif642@...il.com>
To: akpm@...ux-foundation.org
Cc: hannes@...xchg.org,
	shakeel.butt@...ux.dev,
	david@...hat.com,
	ying.huang@...el.com,
	hughd@...gle.com,
	willy@...radead.org,
	yosryahmed@...gle.com,
	nphamcs@...il.com,
	chengming.zhou@...ux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	Usama Arif <usamaarif642@...il.com>
Subject: [RESEND v8 0/2] mm: store zero pages to be swapped out in a bitmap

Resending it, as the CC had "Huang, Ying" in one of the initial patches,
and it was rejected by git send-email because of the "," in name.

The original series [1] was almost merged, but was dropped
due to a last minute bug [2]. Resending this with the fix for it,
by handling zeromap in the same way as swap_map and cluster_info in
enable_swap_info, holding swapon_mutex and si->lock, hence avoiding
a race condition between swapon and any point where the lock is held. 
This is the safest way.

The series had already been reviewed and acked by all maintainers.

Hoping that this attempt goes better than the initial one :)

This patchseries is based on mm-unstable from today:
4926e8348e10 - (akpm/mm-unstable) mm: optimization on page allocation when CMA enabled

[1] https://lore.kernel.org/all/20240627105730.3110705-1-usamaarif642@gmail.com/
[2] https://lore.kernel.org/all/202407101031.c6c3c651-lkp@intel.com/

Usama Arif (2):
  mm: store zero pages to be swapped out in a bitmap
  mm: remove code to handle same filled pages

 include/linux/swap.h |   1 +
 mm/page_io.c         | 118 ++++++++++++++++++++++++++++++++++++++++++-
 mm/swapfile.c        |  38 ++++++++++++--
 mm/zswap.c           |  85 +++----------------------------
 4 files changed, 159 insertions(+), 83 deletions(-)

-- 
2.43.5