Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755147Ab2FNCzw (ORCPT ); Wed, 13 Jun 2012 22:55:52 -0400 Received: from mga03.intel.com ([143.182.124.21]:12607 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755065Ab2FNCzt (ORCPT ); Wed, 13 Jun 2012 22:55:49 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.71,315,1320652800"; d="scan'208";a="156129381" Message-ID: <4FD95200.1090701@intel.com> Date: Thu, 14 Jun 2012 10:52:48 +0800 From: ShuoX Liu Reply-To: shuox.liu@intel.com User-Agent: Mozilla/5.0 (X11; Linux i686; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: "linux-kernel@vger.kernel.org" CC: Andrew Morton , "Brown, Len" , "Zhang, Yanmin" , "Andrew J. Schorr" , Deepthi Dharwar Subject: [PATCH] cpuidle: move field disable from per-driver to per-cpu Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5181 Lines: 149 From: ShuoX Liu Andrew J.Schorr raises a question. When he changes the disable setting on a single CPU, it affects all the other CPUs. Basically, currently, the disable field is per-driver instead of per-cpu. All the C states of the same driver are shared by all CPU in the same machine. Below patch changes field disable to per-cpu, so we could set this separately for each cpu. Reported-by: Andrew J.Schorr Reviewed-by: Yanmin Zhang Signed-off-by: ShuoX Liu --- drivers/cpuidle/cpuidle.c | 1 - drivers/cpuidle/governors/menu.c | 5 +++-- drivers/cpuidle/sysfs.c | 21 ++++++++++++--------- include/linux/cpuidle.h | 2 +- 4 files changed, 16 insertions(+), 13 deletions(-) diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index d90519c..04e4b76 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -265,7 +265,6 @@ static void poll_idle_init(struct cpuidle_driver *drv) state->power_usage = -1; state->flags = 0; state->enter = poll_idle; - state->disable = 0; } #else static void poll_idle_init(struct cpuidle_driver *drv) {} diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c index 0633575..8391d93 100644 --- a/drivers/cpuidle/governors/menu.c +++ b/drivers/cpuidle/governors/menu.c @@ -281,7 +281,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev) * unless the timer is happening really really soon. */ if (data->expected_us > 5 && - drv->states[CPUIDLE_DRIVER_STATE_START].disable == 0) + dev->states_usage[CPUIDLE_DRIVER_STATE_START].disable == 0) data->last_state_idx = CPUIDLE_DRIVER_STATE_START; /* @@ -290,8 +290,9 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev) */ for (i = CPUIDLE_DRIVER_STATE_START; i < drv->state_count; i++) { struct cpuidle_state *s = &drv->states[i]; + struct cpuidle_state_usage *su = &dev->states_usage[i]; - if (s->disable) + if (su->disable) continue; if (s->target_residency > data->predicted_us) continue; diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c index 88032b4..5f809e3 100644 --- a/drivers/cpuidle/sysfs.c +++ b/drivers/cpuidle/sysfs.c @@ -217,7 +217,8 @@ struct cpuidle_state_attr { struct attribute attr; ssize_t (*show)(struct cpuidle_state *, \ struct cpuidle_state_usage *, char *); - ssize_t (*store)(struct cpuidle_state *, const char *, size_t); + ssize_t (*store)(struct cpuidle_state *, \ + struct cpuidle_state_usage *, const char *, size_t); }; #define define_one_state_ro(_name, show) \ @@ -233,21 +234,22 @@ static ssize_t show_state_##_name(struct cpuidle_state *state, \ return sprintf(buf, "%u\n", state->_name);\ } -#define define_store_state_function(_name) \ +#define define_store_state_ull_function(_name) \ static ssize_t store_state_##_name(struct cpuidle_state *state, \ + struct cpuidle_state_usage *state_usage, \ const char *buf, size_t size) \ { \ - long value; \ + unsigned long long value; \ int err; \ if (!capable(CAP_SYS_ADMIN)) \ return -EPERM; \ - err = kstrtol(buf, 0, &value); \ + err = kstrtoull(buf, 0, &value); \ if (err) \ return err; \ if (value) \ - state->disable = 1; \ + state_usage->_name = 1; \ else \ - state->disable = 0; \ + state_usage->_name = 0; \ return size; \ } @@ -273,8 +275,8 @@ define_show_state_ull_function(usage) define_show_state_ull_function(time) define_show_state_str_function(name) define_show_state_str_function(desc) -define_show_state_function(disable) -define_store_state_function(disable) +define_show_state_ull_function(disable) +define_store_state_ull_function(disable) define_one_state_ro(name, show_state_name); define_one_state_ro(desc, show_state_desc); @@ -318,10 +320,11 @@ static ssize_t cpuidle_state_store(struct kobject *kobj, { int ret = -EIO; struct cpuidle_state *state = kobj_to_state(kobj); + struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj); struct cpuidle_state_attr *cattr = attr_to_stateattr(attr); if (cattr->store) - ret = cattr->store(state, buf, size); + ret = cattr->store(state, state_usage, buf, size); return ret; } diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index 6c26a3d..8570012 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -34,6 +34,7 @@ struct cpuidle_driver; struct cpuidle_state_usage { void *driver_data; + unsigned long long disable; unsigned long long usage; unsigned long long time; /* in US */ }; @@ -46,7 +47,6 @@ struct cpuidle_state { unsigned int exit_latency; /* in US */ int power_usage; /* in mW */ unsigned int target_residency; /* in US */ - unsigned int disable; int (*enter) (struct cpuidle_device *dev, struct cpuidle_driver *drv, -- 1.7.1 -- 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/