linux-kernel - RE: [PATCH v2 0/8] objtool: reduce maximum memory usage

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Date:   Wed, 1 Feb 2023 12:51:46 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Thomas Weißschuh' <linux@...ssschuh.net>,
        "Josh Poimboeuf" <jpoimboe@...nel.org>
CC:     Peter Zijlstra <peterz@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 0/8] objtool: reduce maximum memory usage

From: Thomas Weißschuh.
> Sent: 31 January 2023 03:55
...
> I have another half-finished series that replaces the doubly-linked
> list_heads used by elf.h with a custom singly-linked list.
> This would save a few pointers per struct.
> 
> Do you think this is worth it?

If you allocate the structures in blocks of (say) 256 you
can use an array of pointers to the blocks and then a
32bit index instead of a 64bit pointer.

For real space-saving you might decide that the index can
never exceed 2^^24 and use a bitfield!

	David

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