linux-kernel - [PATCH v1 0/5] PM: Reduce spurious wakeups

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Message-Id: <20250730014708.1516-1-daijunbing@vivo.com>
Date: Wed, 30 Jul 2025 09:47:01 +0800
From: Dai Junbing <daijunbing@...o.com>
To: Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	Miklos Szeredi <miklos@...redi.hu>,
	"Theodore Ts'o" <tytso@....edu>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Cc: opensource.kernel@...o.com,
	Dai Junbing <daijunbing@...o.com>
Subject: [PATCH v1 0/5]  PM: Reduce spurious wakeups

During system suspend/resume, processes in TASK_INTERRUPTIBLE sleep may
be spuriously woken, causing measurable overhead. When many processes 
are in TASK_INTERRUPTIBLE state during frequent suspend/resume cycles, 
this overhead becomes non-trivial - observed particularly on Android 
mobile devices.

Power instrumentation on my Android test device revealed numerous 
processes blocked in:
- epoll_wait(2)
- select(2)
- poll(2)
These processes experienced spurious wakeups during suspend/resume,
contributing to power consumption.

After optimizing these wakeups (driver modifications handled outside
this patchset), measurements show 58% reduction in energy consumption
during suspend/resume cycles.

Therefore, minimizing spurious wakeups during suspend/resume transitions
is essential for mobile power efficiency. Please review this series..

Dai Junbing (5):
  epoll: Make epoll_wait sleep freezable
  select/poll: Make sleep freezable
  pipe: Add TASK_FREEZABLE to read and open sleeps
  fuse: Add TASK_FREEZABLE to device read operations
  jbd2: Add TASK_FREEZABLE to kjournald2 thread

 fs/eventpoll.c    | 2 +-
 fs/fuse/dev.c     | 2 +-
 fs/jbd2/journal.c | 2 +-
 fs/pipe.c         | 4 ++--
 fs/select.c       | 4 ++--
 5 files changed, 7 insertions(+), 7 deletions(-)

-- 
2.25.1