From: Jeff King <peff@peff•net>
To: "René Scharfe" <l.s.r@web•de>
Cc: Git List <git@vger•kernel.org>
Subject: Re: [PATCH 2/3] prio-queue: add prio_queue_replace()
Date: Wed, 16 Jul 2025 01:09:33 -0400 [thread overview]
Message-ID: <20250716050933.GC1396022@coredump.intra.peff.net> (raw)
In-Reply-To: <cbabed69-b44a-4920-9a56-e81b404be2de@web.de>
On Tue, Jul 15, 2025 at 04:51:22PM +0200, René Scharfe wrote:
> Add a function to replace the top element of the queue that basically
> does the same as prio_queue_get() followed by prio_queue_put(), but
> without the work by prio_queue_get() to rebalance the heap. It can be
> used to optimize loops that get one element and then immediately add
> another one. That's common e.g., with commit history traversal, where
> we get out a commit and then put in its parents.
Hmm. But surely we still need to rebalance the heap after adding an
element? And indeed, we still call the new sift_down_root() function.
But I guess we are getting away without the "bubble up" operation that
put would do? So we are doing half as much work (but still big-O the
same)?
-Peff
next prev parent reply other threads:[~2025-07-16 5:09 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-15 14:35 [PATCH 0/3] commit: convert pop_most_recent_commit() to prio_queue René Scharfe
2025-07-15 14:51 ` [PATCH 1/3] " René Scharfe
2025-07-15 19:23 ` Junio C Hamano
2025-07-15 20:47 ` Justin Tobler
2025-07-16 9:39 ` René Scharfe
2025-07-16 5:05 ` Jeff King
2025-07-16 9:39 ` René Scharfe
2025-07-17 8:22 ` René Scharfe
2025-07-19 6:55 ` Jeff King
2025-07-19 6:57 ` Jeff King
2025-07-19 11:15 ` René Scharfe
2025-07-20 0:03 ` Jeff King
2025-07-20 1:22 ` Junio C Hamano
2025-07-16 22:23 ` Junio C Hamano
2025-07-17 8:22 ` René Scharfe
2025-07-15 14:51 ` [PATCH 2/3] prio-queue: add prio_queue_replace() René Scharfe
2025-07-16 5:09 ` Jeff King [this message]
2025-07-16 9:38 ` René Scharfe
2025-07-17 9:20 ` René Scharfe
2025-07-19 7:02 ` Jeff King
2025-07-15 14:51 ` [PATCH 3/3] commit: use prio_queue_replace() in pop_most_recent_commit() René Scharfe
2025-07-15 20:43 ` Junio C Hamano
2025-07-16 9:38 ` René Scharfe
2025-07-16 0:07 ` [PATCH 0/3] commit: convert pop_most_recent_commit() to prio_queue Junio C Hamano
2025-07-16 5:15 ` Jeff King
2025-07-16 9:38 ` René Scharfe
2025-07-19 6:45 ` Jeff King
2025-07-16 14:49 ` Junio C Hamano
2025-07-18 9:09 ` [PATCH v2 " René Scharfe
2025-07-18 9:39 ` [PATCH v2 1/3] " René Scharfe
2025-07-21 14:02 ` Lidong Yan
2025-08-03 9:54 ` René Scharfe
2025-08-03 16:48 ` Junio C Hamano
2025-08-04 19:56 ` René Scharfe
2025-07-18 9:39 ` [PATCH v2 3/3] commit: use prio_queue_replace() in pop_most_recent_commit(),MIME-Version: 1.0 René Scharfe
2025-08-03 11:12 ` Johannes Schindelin
2025-08-03 11:33 ` René Scharfe
2025-07-18 9:39 ` [PATCH v2 2/3] prio-queue: add prio_queue_replace() René Scharfe
2025-07-19 7:04 ` [PATCH v2 0/3] commit: convert pop_most_recent_commit() to prio_queue Jeff King
2025-07-22 6:26 ` SZEDER Gábor
2025-07-22 14:27 ` Junio C Hamano
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