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From: Kuan-Wei Chiu <visitorckw@gmail.com>
To: colyli@suse.de, kent.overstreet@linux.dev
Cc: bfoster@redhat.com, jserv@ccns.ncku.edu.tw,
	linux-bcache@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-bcachefs@vger.kernel.org,
	Kuan-Wei Chiu <visitorckw@gmail.com>
Subject: [PATCH 0/5] Optimize number of comparisons for heap/heapsort implementaion
Date: Sun, 21 Jan 2024 23:36:44 +0800	[thread overview]
Message-ID: <20240121153649.2733274-1-visitorckw@gmail.com> (raw)

Hello,

The existing implementations of heap/heapsort follow the conventional
textbook approach, where each heapify operation requires approximately
2*log2(n) comparisons. In this series, I introduce a bottom-up variant
that reduces the number of comparisons during heapify operations to
approximately log2(n), while maintaining the same number of swap
operations.

Thanks,
Kuan-Wei

Kuan-Wei Chiu (5):
  bcachefs: Optimize eytzinger0_sort() using bottom-up heapsort
  bcachefs: Introduce parent function for sort_cmp_size()
  bcachefs: Optimize sort_cmp_size() using bottom-up heapsort
  bcachefs: Optimize number of comparisons in heap_sift_down
  bcache: Optimize number of comparisons in heap_sift

 drivers/md/bcache/util.h |  23 +++++----
 fs/bcachefs/util.c       | 109 ++++++++++++++++++++++++++-------------
 fs/bcachefs/util.h       |  23 +++++----
 3 files changed, 98 insertions(+), 57 deletions(-)

-- 
2.25.1


             reply	other threads:[~2024-01-21 15:36 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-01-21 15:36 Kuan-Wei Chiu [this message]
2024-01-21 15:36 ` [PATCH 1/5] bcachefs: Optimize eytzinger0_sort() using bottom-up heapsort Kuan-Wei Chiu
2024-01-21 15:36 ` [PATCH 2/5] bcachefs: Introduce parent function for sort_cmp_size() Kuan-Wei Chiu
2024-01-21 16:17   ` Kent Overstreet
2024-01-21 17:05     ` Kuan-Wei Chiu
2024-01-21 17:37       ` Kent Overstreet
2024-01-21 15:36 ` [PATCH 3/5] bcachefs: Optimize sort_cmp_size() using bottom-up heapsort Kuan-Wei Chiu
2024-01-21 15:36 ` [PATCH 4/5] bcachefs: Optimize number of comparisons in heap_sift_down Kuan-Wei Chiu
2024-01-21 15:36 ` [PATCH 5/5] bcache: Optimize number of comparisons in heap_sift Kuan-Wei Chiu
2024-01-21 16:21 ` [PATCH 0/5] Optimize number of comparisons for heap/heapsort implementaion Kent Overstreet
2024-01-21 16:55   ` Kuan-Wei Chiu
2024-01-21 17:41     ` Kent Overstreet
2024-01-22 15:06       ` Kuan-Wei Chiu
2024-01-22 16:06         ` Kent Overstreet
2024-01-22 16:23           ` Kuan-Wei Chiu

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