Re: [patch 06/23] SLUB: Extend slabinfo to support -D and -C options

[Mel Gorman]

On (06/11/07 17:11), Christoph Lameter didst pronounce:
> -D lists caches that support defragmentation
> 
> -C lists caches that use a ctor.
> 
> Change field names for defrag_ratio and remote_node_defrag_ratio.
> 
> Add determination of the allocation ratio for a slab. The allocation ratio
> is the percentage of available slots for objects in use.
> 

Total aside, is there any plan to merge slabinfo or something similar in
procps? Alternatively, is having a compatability /proc/slabinfo in the works
anywhere? Latest git doesn't appear to have anything on it but I could easily
have missed it in -mm or somewhere else.

> Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
> Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
> ---
>  Documentation/vm/slabinfo.c |   52 +++++++++++++++++++++++++++++++++++++-------
>  1 file changed, 44 insertions(+), 8 deletions(-)
> 
> Index: linux-2.6.23-mm1/Documentation/vm/slabinfo.c
> ===================================================================
> --- linux-2.6.23-mm1.orig/Documentation/vm/slabinfo.c	2007-10-12 16:25:54.000000000 -0700
> +++ linux-2.6.23-mm1/Documentation/vm/slabinfo.c	2007-10-12 17:58:14.000000000 -0700
> @@ -31,6 +31,8 @@ struct slabinfo {
>  	int hwcache_align, object_size, objs_per_slab;
>  	int sanity_checks, slab_size, store_user, trace;
>  	int order, poison, reclaim_account, red_zone;
> +	int defrag, ctor;
> +	int defrag_ratio, remote_node_defrag_ratio;
>  	unsigned long partial, objects, slabs;
>  	int numa[MAX_NODES];
>  	int numa_partial[MAX_NODES];
> @@ -57,6 +59,8 @@ int show_slab = 0;
>  int skip_zero = 1;
>  int show_numa = 0;
>  int show_track = 0;
> +int show_defrag = 0;
> +int show_ctor = 0;
>  int show_first_alias = 0;
>  int validate = 0;
>  int shrink = 0;
> @@ -91,18 +95,20 @@ void fatal(const char *x, ...)
>  void usage(void)
>  {
>  	printf("slabinfo 5/7/2007. (c) 2007 sgi. clameter@xxxxxxx\n\n"
> -		"slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
> +		"slabinfo [-aCDefhilnosSrtTvz1] [-d debugopts] [slab-regexp]\n"
>  		"-a|--aliases           Show aliases\n"
> +		"-C|--ctor              Show slabs with ctors\n"
>  		"-d<options>|--debug=<options> Set/Clear Debug options\n"
> -		"-e|--empty		Show empty slabs\n"
> +		"-D|--defrag            Show defragmentable caches\n"
> +		"-e|--empty             Show empty slabs\n"
>  		"-f|--first-alias       Show first alias\n"
>  		"-h|--help              Show usage information\n"
>  		"-i|--inverted          Inverted list\n"
>  		"-l|--slabs             Show slabs\n"
>  		"-n|--numa              Show NUMA information\n"
> -		"-o|--ops		Show kmem_cache_ops\n"
> +		"-o|--ops               Show kmem_cache_ops\n"
>  		"-s|--shrink            Shrink slabs\n"
> -		"-r|--report		Detailed report on single slabs\n"
> +		"-r|--report            Detailed report on single slabs\n"
>  		"-S|--Size              Sort by size\n"
>  		"-t|--tracking          Show alloc/free information\n"
>  		"-T|--Totals            Show summary information\n"
> @@ -282,7 +288,7 @@ int line = 0;
>  void first_line(void)
>  {
>  	printf("Name                   Objects Objsize    Space "
> -		"Slabs/Part/Cpu  O/S O %%Fr %%Ef Flg\n");
> +		"Slabs/Part/Cpu  O/S O %%Ra %%Ef Flg\n");
>  }
>  
>  /*
> @@ -325,7 +331,7 @@ void slab_numa(struct slabinfo *s, int m
>  		return;
>  
>  	if (!line) {
> -		printf("\n%-21s:", mode ? "NUMA nodes" : "Slab");
> +		printf("\n%-21s: Rto ", mode ? "NUMA nodes" : "Slab");
>  		for(node = 0; node <= highest_node; node++)
>  			printf(" %4d", node);
>  		printf("\n----------------------");
> @@ -334,6 +340,7 @@ void slab_numa(struct slabinfo *s, int m
>  		printf("\n");
>  	}
>  	printf("%-21s ", mode ? "All slabs" : s->name);
> +	printf("%3d ", s->remote_node_defrag_ratio);
>  	for(node = 0; node <= highest_node; node++) {
>  		char b[20];
>  
> @@ -407,6 +414,8 @@ void report(struct slabinfo *s)
>  		printf("** Slabs are destroyed via RCU\n");
>  	if (s->reclaim_account)
>  		printf("** Reclaim accounting active\n");
> +	if (s->defrag)
> +		printf("** Defragmentation at %d%%\n", s->defrag_ratio);
>  
>  	printf("\nSizes (bytes)     Slabs              Debug                Memory\n");
>  	printf("------------------------------------------------------------------------\n");
> @@ -453,6 +462,12 @@ void slabcache(struct slabinfo *s)
>  	if (show_empty && s->slabs)
>  		return;
>  
> +	if (show_defrag && !s->defrag)
> +		return;
> +
> +	if (show_ctor && !s->ctor)
> +		return;
> +
>  	store_size(size_str, slab_size(s));
>  	snprintf(dist_str, 40, "%lu/%lu/%d", s->slabs, s->partial, s->cpu_slabs);
>  
> @@ -463,6 +478,10 @@ void slabcache(struct slabinfo *s)
>  		*p++ = '*';
>  	if (s->cache_dma)
>  		*p++ = 'd';
> +	if (s->defrag)
> +		*p++ = 'D';
> +	if (s->ctor)
> +		*p++ = 'C';
>  	if (s->hwcache_align)
>  		*p++ = 'A';
>  	if (s->poison)
> @@ -482,7 +501,7 @@ void slabcache(struct slabinfo *s)
>  	printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
>  		s->name, s->objects, s->object_size, size_str, dist_str,
>  		s->objs_per_slab, s->order,
> -		s->slabs ? (s->partial * 100) / s->slabs : 100,
> +		s->slabs ? (s->objects * 100) / (s->slabs * s->objs_per_slab) : 100,
>  		s->slabs ? (s->objects * s->object_size * 100) /
>  			(s->slabs * (page_size << s->order)) : 100,
>  		flags);
> @@ -1074,7 +1093,16 @@ void read_slab_dir(void)
>  			free(t);
>  			slab->store_user = get_obj("store_user");
>  			slab->trace = get_obj("trace");
> +			slab->defrag_ratio = get_obj("defrag_ratio");
> +			slab->remote_node_defrag_ratio =
> +					get_obj("remote_node_defrag_ratio");
>  			chdir("..");
> +			if (read_slab_obj(slab, "ops")) {
> +				if (strstr(buffer, "ctor :"))
> +					slab->ctor = 1;
> +				if (strstr(buffer, "kick :"))
> +					slab->defrag = 1;
> +			}
>  			if (slab->name[0] == ':')
>  				alias_targets++;
>  			slab++;
> @@ -1124,7 +1152,9 @@ void output_slabs(void)
>  
>  struct option opts[] = {
>  	{ "aliases", 0, NULL, 'a' },
> +	{ "ctor", 0, NULL, 'C' },
>  	{ "debug", 2, NULL, 'd' },
> +	{ "defrag", 0, NULL, 'D' },
>  	{ "empty", 0, NULL, 'e' },
>  	{ "first-alias", 0, NULL, 'f' },
>  	{ "help", 0, NULL, 'h' },
> @@ -1149,7 +1179,7 @@ int main(int argc, char *argv[])
>  
>  	page_size = getpagesize();
>  
> -	while ((c = getopt_long(argc, argv, "ad::efhil1noprstvzTS",
> +	while ((c = getopt_long(argc, argv, "ad::efhil1noprstvzCDTS",
>  						opts, NULL)) != -1)
>  		switch (c) {
>  		case '1':
> @@ -1199,6 +1229,12 @@ int main(int argc, char *argv[])
>  		case 'z':
>  			skip_zero = 0;
>  			break;
> +		case 'C':
> +			show_ctor = 1;
> +			break;
> +		case 'D':
> +			show_defrag = 1;
> +			break;
>  		case 'T':
>  			show_totals = 1;
>  			break;
> 
> -- 
> 

-- 
-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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