linux-kernel - Re: [PATCH 1/2] mm: Rename ambiguously named memory.stat counters and functions

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Message-ID: <20190123235940.GA21563@castle.DHCP.thefacebook.com>
Date:   Wed, 23 Jan 2019 23:59:47 +0000
From:   Roman Gushchin <guro@...com>
To:     Chris Down <chris@...isdown.name>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>, Tejun Heo <tj@...nel.org>,
        Dennis Zhou <dennis@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH 1/2] mm: Rename ambiguously named memory.stat counters and
 functions

On Wed, Jan 23, 2019 at 05:30:49PM -0500, Chris Down wrote:
> I spent literally an hour trying to work out why an earlier version of
> my memory.events aggregation code doesn't work properly, only to find
> out I was calling memcg->events instead of memcg->memory_events, which
> is fairly confusing.
> 
> This naming seems in need of reworking, so make it harder to do the
> wrong thing by using vmevents instead of events, which makes it more
> clear that these are vm counters rather than memcg-specific counters.
> 
> There are also a few other inconsistent names in both the percpu and
> aggregated structs, so these are all cleaned up to be more coherent and
> easy to understand.
> 
> This commit contains code cleanup only: there are no logic changes.
> 
> Signed-off-by: Chris Down <chris@...isdown.name>
> Acked-by: Johannes Weiner <hannes@...xchg.org>
> To: Andrew Morton <akpm@...ux-foundation.org>

s/To/Cc

> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Roman Gushchin <guro@...com>
> Cc: Dennis Zhou <dennis@...nel.org>
> Cc: linux-kernel@...r.kernel.org
> Cc: cgroups@...r.kernel.org
> Cc: linux-mm@...ck.org
> Cc: kernel-team@...com
> ---
> include/linux/memcontrol.h |  24 +++----
> mm/memcontrol.c            | 137 +++++++++++++++++++------------------
> 2 files changed, 82 insertions(+), 79 deletions(-)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index b0eb29ea0d9c..380a212a8c52 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -94,8 +94,8 @@ enum mem_cgroup_events_target {
> 	MEM_CGROUP_NTARGETS,
> };
> 
> -struct mem_cgroup_stat_cpu {
> -	long count[MEMCG_NR_STAT];
> +struct memcg_vmstats_percpu {
> +	long stat[MEMCG_NR_STAT];

I'd personally go with memcg_vmstat_percpu. Not insisting,
but you end up using both vmstat and vmstats, which isn't very
consistent.

Other than that looks good to me. Please, feel free to add
Acked-by: Roman Gushchin <guro@...com>

Thanks!