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From: Alviro Iskandar Setiawan <alviro.iskandar@gnuweeb.org>
Date: Tue, 22 Mar 2022 19:36:11 +0700
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Subject: Re: [RFC PATCH v2 6/8] tools/nolibc/stdlib: Implement `malloc()`,
 `calloc()`, `realloc()` and `free()`
To: Ammar Faizi <ammarfaizi2@gnuweeb.org>
Cc: David Laight <David.Laight@aculab.com>, Willy Tarreau <w@1wt.eu>, 
	"Paul E. McKenney" <paulmck@kernel.org>, Nugraha <richiisei@gmail.com>, 
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, 
	"GNU/Weeb Mailing List" <gwml@vger.gnuweeb.org>
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On Tue, Mar 22, 2022 at 7:18 PM Ammar Faizi wrote:
> Rounding up is not useful here, because we don't have any free list to keep
> track the unused block of memory. I mean, even if it's rounded up, the extra
> space after rounded up cannot be utilized with this design. There is no
> book-keeping that tracks it.
>
> Though, the kernel still allocates the size in multiple page size.

BTW, what David meant probably, don't call mmap() again if heap->len
is greater than new_len. Isn't that simple enough to give it a go?

-- Viro