Messages in this thread Patch in this message | | | From | Balbir Singh <> | Date | Fri, 10 Nov 2006 01:06:19 +0530 | Subject | [RFC][PATCH 6/8] RSS controller shares allocation |
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Support shares assignment and propagation.
Signed-off-by: Balbir Singh <balbir@in.ibm.com> ---
kernel/res_group/memctlr.c | 59 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 58 insertions(+), 1 deletion(-)
diff -puN kernel/res_group/memctlr.c~container-memctlr-shares kernel/res_group/memctlr.c --- linux-2.6.19-rc2/kernel/res_group/memctlr.c~container-memctlr-shares 2006-11-09 22:20:28.000000000 +0530 +++ linux-2.6.19-rc2-balbir/kernel/res_group/memctlr.c 2006-11-09 22:20:28.000000000 +0530 @@ -32,6 +32,7 @@ #include <linux/res_group_rc.h> #include <linux/memctlr.h> #include <linux/mm.h> +#include <linux/swap.h> #include <asm/pgtable.h> static const char res_ctlr_name[] = "memctlr"; @@ -55,6 +56,7 @@ struct memctlr { int failures; int magic; spinlock_t lock; + long nr_pages; }; struct res_controller memctlr_rg; @@ -180,6 +182,7 @@ static void memctlr_init_new(struct memc res->shares.unused_min_shares = SHARE_DEFAULT_DIVISOR; memctlr_init_mem_counter(&res->counter); + res->nr_pages = SHARE_DONT_CARE; spin_lock_init(&res->lock); } @@ -196,6 +199,7 @@ static struct res_shares *memctlr_alloc_ if (is_res_group_root(rgroup)) { root_rgroup = rgroup; memctlr_root = res; + res->nr_pages = nr_free_pages(); printk("Memory Controller version %s\n", version); } return &res->shares; @@ -346,6 +350,11 @@ static ssize_t memctlr_show_stats(struct len -= i; j += i; + i = snprintf(buf, len, "Max Allowed Pages %ld\n", res->nr_pages); + + buf += i; + len -= i; + j += i; return j; } @@ -406,13 +415,61 @@ static void memctlr_move_task(struct tas double_res_unlock(oldres, newres); } +static void recalc_and_propagate(struct memctlr *res, struct memctlr *parres) +{ + struct resource_group *child = NULL; + int child_divisor; + u64 numerator; + struct memctlr *child_res; + + if (parres) { + if (res->shares.max_shares == SHARE_DONT_CARE || + parres->shares.max_shares == SHARE_DONT_CARE) + return; + + child_divisor = parres->shares.child_shares_divisor; + if (child_divisor == 0) + return; + + numerator = (u64)(parres->shares.unused_min_shares * + res->shares.max_shares); + do_div(numerator, child_divisor); + numerator = (u64)(parres->nr_pages * numerator); + do_div(numerator, SHARE_DEFAULT_DIVISOR); + res->nr_pages = numerator; + } + + for_each_child(child, res->rgroup) { + child_res = get_memctlr(child); + BUG_ON(!child_res); + recalc_and_propagate(child_res, res); + } + +} + +static void memctlr_shares_changed(struct res_shares *shares) +{ + struct memctlr *res, *parres; + + res = get_memctlr_from_shares(shares); + if (!res) + return; + + if (is_res_group_root(res->rgroup)) + parres = NULL; + else + parres = get_memctlr((struct container *)res->rgroup->parent); + + recalc_and_propagate(res, parres); +} + struct res_controller memctlr_rg = { .name = res_ctlr_name, .ctlr_id = NO_RES_ID, .alloc_shares_struct = memctlr_alloc_instance, .free_shares_struct = memctlr_free_instance, .move_task = memctlr_move_task, - .shares_changed = NULL, + .shares_changed = memctlr_shares_changed, .show_stats = memctlr_show_stats, }; _ --
Balbir Singh, Linux Technology Center, IBM Software Labs - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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