linux-kernel - [PATCH v2 0/2] PM: hibernate: make compression threads configurable and support dynamic crc arrays

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Message-ID: <cover.1757575365.git.luoxueqin@kylinos.cn>
Date: Thu, 11 Sep 2025 16:09:49 +0800
From: Xueqin Luo <luoxueqin@...inos.cn>
To: rafael@...nel.org,
	pavel@...nel.org,
	lenb@...nel.org,
	linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Xueqin Luo <luoxueqin@...inos.cn>
Subject: [PATCH v2 0/2] PM: hibernate: make compression threads configurable and support dynamic crc arrays

Hi,

This is v2 of the series to make hibernate compression/decompression
threads configurable and improve scalability.

Changes since v1:
 - Added a new patch to dynamically allocate crc->unc_len/unc based on
   the number of threads selected at runtime. This removes the compile-
   time limit (CMP_THREADS) and enables support for arbitrary thread
   counts.
 - Enhanced the commit message of patch 1 to include more background
   information and performance numbers showing resume latency
   improvements when increasing compression threads.


In our measurements (averaged over 10 runs), increasing compression
threads from 3 to 5–6 improves resume latency by ~12% . Allowing
runtime configurability enables integrators to tune performance across
different hardware without recompiling the kernel. Dynamic allocation
further removes the compile-time limit and supports arbitrary thread
counts.	

Xueqin Luo (2):
  PM: hibernate: dynamically allocate crc->unc_len/unc for configurable
    threads
  PM: hibernate: make compression threads configurable

 kernel/power/swap.c | 66 ++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 59 insertions(+), 7 deletions(-)

-- 
2.43.0