On (09/10/08 20:20), Andy Whitcroft didst pronounce:
> Allow resize of specific pools via the --pool-minimum-adjust and
> --pool-maximum-adjust commands. The first affects the number of static
> pages in the pool, the second affects the number of overcommit pages
> for the pool. These are exposed as lower and upper bound on the pool
> to match the display in --pool-list. Adjustments are either absolute,
> or relative with a + or - prefix. For exmaple the following incantion
> increases the 2MB page pool minimum by 10 pages.
>
> --pool-minimum-adjust 2048kb:+10
>
> Signed-off-by: Andy Whitcroft <[EMAIL PROTECTED]>
> ---
> hpoolcfg.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
> 1 files changed, 84 insertions(+), 2 deletions(-)
>
> diff --git a/hpoolcfg.c b/hpoolcfg.c
> index 9e21864..8b70389 100644
> --- a/hpoolcfg.c
> +++ b/hpoolcfg.c
> @@ -35,6 +35,7 @@
>
> #define REPORT_UTIL "hpoolcfg"
> #include "libhugetlbfs_internal.h"
> +#include "hugetlbfs.h"
>
> extern int optind;
> extern char *optarg;
> @@ -48,6 +49,10 @@ void print_usage()
> fprintf(stderr, "options:\n");
>
> OPTION("--pool-list", "List all pools");
> + OPTION("--pool-pages-min <size>=[+|-]<count>", "");
> + CONT("Adjust pool 'size' lower bound");
> + OPTION("--pool-pages-max <size>=[+|-]<count>", "");
> + CONT("Adjust pool 'size' upper bound");
>
> OPTION("--help, -h", "Prints this message");
> }
> @@ -57,8 +62,10 @@ int opt_dry_run = 0;
> /*
> * getopts return values for options which are long only.
> */
> -#define LONG_POOL ('p' << 8)
> -#define LONG_POOL_LIST (LONG_POOL|'l')
> +#define LONG_POOL ('p' << 8)
> +#define LONG_POOL_LIST (LONG_POOL|'l')
> +#define LONG_POOL_MIN_ADJ (LONG_POOL|'m')
> +#define LONG_POOL_MAX_ADJ (LONG_POOL|'M')
>
> #define MAX_POOLS 32
> void pool_list(void)
> @@ -81,6 +88,71 @@ void pool_list(void)
> }
> }
>
> +void pool_adjust(char *cmd, unsigned int counter)
> +{
> + struct hpage_pool pools[MAX_POOLS];
> + int pos;
> + int cnt;
> +
> + char *iter = NULL;
> + char *page_size_str = NULL;
> + char *adjust_str = NULL;
> + long page_size;
> + long adjust;
> + unsigned long base = 0;
> +
> + /* Extract the pagesize and adjustment. */
> + page_size_str = strtok_r(cmd, ":", &iter);
> + if (page_size_str)
> + adjust_str = strtok_r(NULL, ":", &iter);
> +
> + if (!page_size_str || !adjust_str) {
> + ERROR("%s: invalid resize specificiation\n", cmd);
> + exit(EXIT_FAILURE);
> + }
> + DEBUG("page_size<%s> adjust<%s> counter<%d>\n",
> + page_size_str, adjust_str, counter);
> +
> + /* Convert and validate the page_size. */
> + page_size = __lh_parse_page_size(page_size_str);
> +
> + cnt = __lh_hpool_sizes(pools, MAX_POOLS);
> + if (cnt < 0) {
> + ERROR("unable to obtain pools list");
> + exit(EXIT_FAILURE);
> + }
> + for (pos = 0; cnt--; pos++) {
> + if (pools[pos].pagesize_kb == page_size)
> + break;
> + }
> + if (cnt < 0) {
> + ERROR("%s: unknown page size\n", page_size_str);
> + exit(EXIT_FAILURE);
> + }
> +
> + /* Convert and validate the adjust. */
> + adjust = strtol(adjust_str, NULL, 0);
> +
> + if (adjust_str[0] == '+' || adjust_str[0] == '-') {
> +
> + /*
> + * XXX: reading HUGEPAGES_TOTAL gives you the total pages
> + * in use not what you wrote.
> + */
> + if (counter == HUGEPAGES_TOTAL)
> + base = pools[pos].minimum;
> + else if (counter == HUGEPAGES_OC)
> + base = pools[pos].maximum - pools[pos].minimum;
> + else
> + base = get_huge_page_counter(page_size, counter);
> + } else {
> + if (counter == HUGEPAGES_OC)
> + base = -pools[pos].minimum;
> + }
> + adjust += base;
> + set_huge_page_counter(page_size, counter, adjust);
Nothing stops adjust going negative here or wrapping
> +}
> +
> int main(int argc, char** argv)
> {
> char opts[] = "+h";
> @@ -89,6 +161,8 @@ int main(int argc, char** argv)
> {"help", no_argument, NULL, 'h'},
>
> {"pool-list", no_argument, NULL, LONG_POOL_LIST},
> + {"pool-pages-min", required_argument, NULL, LONG_POOL_MIN_ADJ},
> + {"pool-pages-max", required_argument, NULL, LONG_POOL_MAX_ADJ},
>
> {0},
> };
> @@ -113,6 +187,14 @@ int main(int argc, char** argv)
> pool_list();
> break;
>
> + case LONG_POOL_MIN_ADJ:
> + pool_adjust(optarg, HUGEPAGES_TOTAL);
> + break;
> +
> + case LONG_POOL_MAX_ADJ:
> + pool_adjust(optarg, HUGEPAGES_OC);
> + break;
> +
> default:
> WARNING("unparsed option %08x\n", ret);
> ret = -1;
> --
> 1.6.0.1.451.gc8d31
>
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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