linux-kernel - Re: [PATCH] mm:slab: Adjust the print format for the slabinfo

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Date:   Tue, 2 Oct 2018 07:57:04 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     jun qian <hangdianqj@....com>
Cc:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Barry song <21cnbao@...il.com>
Subject: Re: [PATCH] mm:slab: Adjust the print format for the slabinfo

On Mon 01-10-18 19:59:39, jun qian wrote:
> Header and the corresponding information is not aligned,
> adjust the printing format helps us to understand the slabinfo better.

What prevents you from formating the output when printint the file? In
other words why do we want to do special formating in the kernel?
 
> Signed-off-by: jun qian <hangdianqj@....com>
> Cc: Barry song <21cnbao@...il.com>
> ---
>  mm/slab_common.c | 16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/mm/slab_common.c b/mm/slab_common.c
> index fea3376f9816..07a324cbbfb6 100644
> --- a/mm/slab_common.c
> +++ b/mm/slab_common.c
> @@ -1263,9 +1263,13 @@ static void print_slabinfo_header(struct seq_file *m)
>  #else
>  	seq_puts(m, "slabinfo - version: 2.1\n");
>  #endif
> -	seq_puts(m, "# name            <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab>");
> -	seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>");
> -	seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>");
> +	seq_printf(m, "%-22s %-14s %-11s %-10s %-13s %-14s",
> +		  "# name", "<active_objs>", "<num_objs>", "<objsize>",
> +		  "<objperslab>", "<pagesperslab>");
> +	seq_printf(m, " : %-9s %-8s %-13s %-14s",
> +		  "tunables", "<limit>", "<batchcount>", "<sharedfactor>");
> +	seq_printf(m, " : %-9s %-15s %-12s %-16s",
> +		  "slabdata", "<active_slabs>", "<num_slabs>", "<sharedavail>");
>  #ifdef CONFIG_DEBUG_SLAB
>  	seq_puts(m, " : globalstat <listallocs> <maxobjs> <grown> <reaped> <error> <maxfreeable> <nodeallocs> <remotefrees> <alienoverflow>");
>  	seq_puts(m, " : cpustat <allochit> <allocmiss> <freehit> <freemiss>");
> @@ -1319,13 +1323,13 @@ static void cache_show(struct kmem_cache *s, struct seq_file *m)
>  
>  	memcg_accumulate_slabinfo(s, &sinfo);
>  
> -	seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d",
> +	seq_printf(m, "%-22s %-14lu %-11lu %-10u %-13u %-14d",
>  		   cache_name(s), sinfo.active_objs, sinfo.num_objs, s->size,
>  		   sinfo.objects_per_slab, (1 << sinfo.cache_order));
>  
> -	seq_printf(m, " : tunables %4u %4u %4u",
> +	seq_printf(m, " : %-9s %-8u %-13u %-14u", "tunables",
>  		   sinfo.limit, sinfo.batchcount, sinfo.shared);
> -	seq_printf(m, " : slabdata %6lu %6lu %6lu",
> +	seq_printf(m, " : %-9s %-15lu %-12lu %-16lu", "slabdata",
>  		   sinfo.active_slabs, sinfo.num_slabs, sinfo.shared_avail);
>  	slabinfo_show_stats(m, s);
>  	seq_putc(m, '\n');
> -- 
> 2.17.1
> 
> 

-- 
Michal Hocko
SUSE Labs