GNU bug report logs - #78735
feature/igc: [PATCH] Reduce the size of the kbd-buffer GC root

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Helmut Eller <eller.helmut <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: feature/igc: [PATCH] Reduce the size of the kbd-buffer GC root
Date: Mon, 09 Jun 2025 21:36:45 +0200

[Message part 1 (text/plain, inline)]

This is a proposal to reduce of the size of the kbd-buffer root.
Currently the kdb-buffer is an area of ~250kb that is scanned
ambiguously.

With the patch, instead of tracing the entire kbd_buffer, we only scan
the region from kbd_fetch_ptr - 1 to kbd_store_ptr + 1.  The -1/+1 is
supposed to cover the cases where MPS stops the mutator while those
pointers are being updated.  If the kbd_buffer is empty, then only 180
bytes are scanned.  It's still scanned ambiguously.

[0001-Reduce-the-size-of-the-kbd-buffer-GC-root.patch (text/x-diff, attachment)]

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