The patch titled
Subject: lib min_heap: optimize number of calls to min_heapify()
has been added to the -mm mm-nonmm-unstable branch. Its filename is
lib-min_heap-optimize-number-of-calls-to-min_heapify.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/lib-min_heap-optimize-number-of-calls-to-min_heapify.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kuan-Wei Chiu <visitorckw@xxxxxxxxx>
Subject: lib min_heap: optimize number of calls to min_heapify()
Date: Wed, 10 Jan 2024 16:12:12 +0800
Patch series "lib min_heap: Min heap optimizations".
The purpose of this patch series is to enhance the existing min heap
implementation. The optimization focuses on both the heap construction
process and the number of comparisons made during the heapify operation.
This patch (of 2):
Improve the heap construction process by reducing unnecessary heapify
operations. Specifically, adjust the starting condition from n / 2 to n /
2 - 1 in the loop that iterates over all non-leaf elements.
Link: https://lkml.kernel.org/r/20240110081213.2289636-1-visitorckw@xxxxxxxxx
Link: https://lkml.kernel.org/r/20240110081213.2289636-2-visitorckw@xxxxxxxxx
Signed-off-by: Kuan-Wei Chiu <visitorckw@xxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Ian Rogers <irogers@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/min_heap.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/min_heap.h~lib-min_heap-optimize-number-of-calls-to-min_heapify
+++ a/include/linux/min_heap.h
@@ -70,7 +70,7 @@ void min_heapify_all(struct min_heap *he
{
int i;
- for (i = heap->nr / 2; i >= 0; i--)
+ for (i = heap->nr / 2 - 1; i >= 0; i--)
min_heapify(heap, i, func);
}
_
Patches currently in -mm which might be from visitorckw@xxxxxxxxx are
lib-min_heap-optimize-number-of-calls-to-min_heapify.patch
lib-min_heap-optimize-number-of-comparisons-in-min_heapify.patch
