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Message-ID: <20071108150007.GC2591@skynet.ie>
Date: Thu, 8 Nov 2007 15:00:07 +0000
From: mel@...net.ie (Mel Gorman)
To: Christoph Lameter <clameter@....com>
Cc: akpm@...ux-foundatin.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org
Subject: Re: [patch 06/23] SLUB: Extend slabinfo to support -D and -C options
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@...hat.com>
> Signed-off-by: Christoph Lameter <clameter@....com>
> ---
> 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@....com\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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