lkml.org 
[lkml]   [2022]   [Jun]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v4 24/34] mm/memcontrol.c: Convert to printbuf
On Mon, Jun 20, 2022 at 01:37:56PM +0200, Michal Hocko wrote:
> On Sun 19-06-22 20:42:23, Kent Overstreet wrote:
> > This converts memory_stat_format() from seq_buf to printbuf. Printbuf is
> > simalar to seq_buf except that it heap allocates the string buffer:
> > here, we were already heap allocating the buffer with kmalloc() so the
> > conversion is trivial.
> >
> > Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
>
> I have asked for a justification two times already not hearing anything.
> Please drop this patch. I do not see any actual advantage of the
> conversion. The primary downside of the existing code is that an
> internal buffer is exposed to the caller which is error prone and ugly.
> The conversion doesn't really address that part.

Do you want to tone down the hostility? Yeesh.

This patch is part of a wider series that deletes seq_buf, if you missed it here
you go: https://lore.kernel.org/all/20220620004233.3805-1-kent.overstreet@gmail.com/

> Moreover there is an inconsistency between failrure case where the
> printbuf is destroyed by a docummented way (printbuf_exit) and when the
> caller frees the buffer directly. If printbuf_exit evers need to do more
> than just kfree (e.g. kvfree) then this is a subtle bug hard to find.

Ok, _that's_ a technical point we can talk about and address. I'll add
documentation to the printbuf code that the buffer must be freeable with
kfree().

\
 
 \ /
  Last update: 2022-06-20 17:21    [W:0.115 / U:1.492 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site