linux-kernel - Re: [PATCH v2 1/8] lib/printbuf: New data structure for heap-allocated strings

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Date:   Sun, 24 Apr 2022 16:46:03 -0700
From:   Joe Perches <joe@...ches.com>
To:     Kent Overstreet <kent.overstreet@...il.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org
Cc:     hch@....de, hannes@...xchg.org, akpm@...ux-foundation.org,
        linux-clk@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-input@...r.kernel.org, roman.gushchin@...ux.dev
Subject: Re: [PATCH v2 1/8] lib/printbuf: New data structure for
 heap-allocated strings

On Thu, 2022-04-21 at 19:48 -0400, Kent Overstreet wrote:
> This adds printbufs: simple heap-allocated strings meant for building up
> structured messages, for logging/procfs/sysfs and elsewhere. They've
> been heavily used in bcachefs for writing .to_text() functions/methods -
> pretty printers, which has in turn greatly improved the overall quality
> of error messages.
> 
> Basic usage is documented in include/linux/printbuf.h.

Given the maximum printk output is less than 1024 bytes, why should
this be allowed to be larger than that or larger than PAGE_SIZE?

> + * pr_human_readable_u64, pr_human_readable_s64: Print an integer with human
> + * readable units.

Why not extend vsprintf for this using something like %pH[8|16|32|64] 
or %pH[c|s|l|ll|uc|us|ul|ull] ?