From: Michal Hocko <mhocko@kernel.org>
To: Pengfei Li <lpf.vector@gmail.com>
Cc: Qian Cai <cai@lca.pw>, Andrew Morton <akpm@linux-foundation.org>,
mgorman@techsingularity.net, vbabka@suse.cz,
aryabinin@virtuozzo.com, osalvador@suse.de, rostedt@goodmis.org,
mingo@redhat.com, pavel.tatashin@microsoft.com,
rppt@linux.ibm.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH 00/10] make "order" unsigned int
Date: Fri, 26 Jul 2019 09:12:19 +0200 [thread overview]
Message-ID: <20190726071219.GC6142@dhcp22.suse.cz> (raw)
In-Reply-To: <CAD7_sbEXQt0oHuD01BXdW2_=G4h8U8ogHVt0N1Yez2ajFJkShw@mail.gmail.com>
On Fri 26-07-19 07:48:36, Pengfei Li wrote:
[...]
> For the benefit, "order" may be negative, which is confusing and weird.
order = -1 has a special meaning.
> There is no good reason not to do this since it can be avoided.
"This is good because we can do it" doesn't really sound like a
convincing argument to me. I would understand if this reduced a
generated code, made an overall code readability much better or
something along those lines. Also we only use MAX_ORDER range of values
so I could argue that a smaller data type (e.g. short) should be
sufficient for this data type.
Please note that _any_ change, alebit seemingly small, can introduce a
subtle bug. Also each patch requires a man power to review so you have
to understand that "just because we can" is not a strong motivation for
people to spend their time on such a patch.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2019-07-26 7:12 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-25 18:42 [PATCH 00/10] make "order" unsigned int Pengfei Li
2019-07-25 18:42 ` [PATCH 01/10] mm/page_alloc: use unsigned int for "order" in should_compact_retry() Pengfei Li
2019-07-25 18:58 ` Matthew Wilcox
2019-07-25 23:21 ` Pengfei Li
2019-07-25 23:21 ` Pengfei Li
2019-07-25 18:42 ` [PATCH 02/10] mm/page_alloc: use unsigned int for "order" in __rmqueue_fallback() Pengfei Li
2019-07-26 9:36 ` Rasmus Villemoes
2019-07-27 2:34 ` Pengfei Li
2019-07-27 2:34 ` Pengfei Li
2019-07-25 18:42 ` [PATCH 03/10] mm/page_alloc: use unsigned int for "order" in should_compact_retry() Pengfei Li
2019-07-25 18:42 ` [PATCH 04/10] mm/page_alloc: remove never used "order" in alloc_contig_range() Pengfei Li
2019-07-25 18:42 ` [PATCH 05/10] mm/compaction: make "order" and "search_order" unsigned int in struct compact_control Pengfei Li
2019-07-25 18:42 ` [PATCH 06/10] mm/compaction: make "order" unsigned int in compaction.c Pengfei Li
2019-07-25 18:42 ` [PATCH 07/10] trace/events/compaction: make "order" unsigned int Pengfei Li
2019-07-25 18:42 ` [PATCH 08/10] mm/compaction: use unsigned int for "compact_order_failed" in struct zone Pengfei Li
2019-07-25 18:42 ` [PATCH 09/10] mm/compaction: use unsigned int for "kcompactd_max_order" in struct pglist_data Pengfei Li
2019-07-25 18:42 ` [PATCH 10/10] mm/vmscan: use unsigned int for "kswapd_order" " Pengfei Li
2019-07-25 18:52 ` [PATCH 00/10] make "order" unsigned int Qian Cai
2019-07-25 18:52 ` Qian Cai
2019-07-25 23:48 ` Pengfei Li
2019-07-25 23:48 ` Pengfei Li
2019-07-26 7:12 ` Michal Hocko [this message]
2019-07-27 17:25 ` Pengfei Li
2019-07-27 17:25 ` Pengfei Li
2019-07-26 7:26 ` Mel Gorman
2019-07-27 16:44 ` Pengfei Li
2019-07-27 16:44 ` Pengfei Li
2019-07-29 8:34 ` Mel Gorman
2019-07-30 5:53 ` Pengfei Li
2019-07-30 5:53 ` Pengfei Li
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