Commit c499c717 authored by Kuan-Wei Chiu's avatar Kuan-Wei Chiu Committed by Andrew Morton
Browse files

lib min_heap: optimize number of calls to min_heapify() 

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@gmail.com
Link: https://lkml.kernel.org/r/20240110081213.2289636-2-visitorckw@gmail.com


Signed-off-by: default avatarKuan-Wei Chiu <visitorckw@gmail.com>
Acked-by: default avatarIan Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent b73aa539

include/linux/min_heap.h

+1 −1
Original line number Diff line number Diff line
@@ -70,7 +70,7 @@ void min_heapify_all(struct min_heap *heap, 
{

	int i;



	for (i = heap->nr / 2; i >= 0; i--)

	for (i = heap->nr / 2 - 1; i >= 0; i--)

		min_heapify(heap, i, func);

}