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

    Reviewed-by: Rik van Riel <riel@redhat.com>
    Signed-off-by: Christoph Lameter <clameter@sgi.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@sgi.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;
    --
    -
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