Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754688Ab1DKHRm (ORCPT ); Mon, 11 Apr 2011 03:17:42 -0400 Received: from e28smtp09.in.ibm.com ([122.248.162.9]:54025 "EHLO e28smtp09.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754232Ab1DKHRl (ORCPT ); Mon, 11 Apr 2011 03:17:41 -0400 From: Trinabh Gupta Subject: [RFC PATCH V2 3/4] Split cpuidle_state structure and move per-cpu statistics fields To: linux-pm@lists.linux-foundation.org, peterz@infradead.org Cc: linux-kernel@vger.kernel.org, rnayak@ti.com, karthik-dp@ti.com, magnus.damm@gmail.com Date: Mon, 11 Apr 2011 12:47:33 +0530 Message-ID: <20110411071724.6348.22246.stgit@tringupt.in.ibm.com> In-Reply-To: <20110411071508.6348.67918.stgit@tringupt.in.ibm.com> References: <20110411071508.6348.67918.stgit@tringupt.in.ibm.com> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11364 Lines: 309 This is the first step towards global registration of cpuidle states. The statistics used primarily by the governor are per-cpu and have to be split from rest of the fields inside cpuidle_state, which would be made global i.e. single copy. The driver_data field is also per-cpu and moved. Signed-off-by: Trinabh Gupta --- drivers/acpi/processor_idle.c | 37 ++++++++++++++++++------------------- drivers/cpuidle/cpuidle.c | 12 +++++++----- drivers/cpuidle/sysfs.c | 15 +++++++++------ include/linux/cpuidle.h | 25 +++++++++++++++---------- 4 files changed, 49 insertions(+), 40 deletions(-) diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 00712a7..bd29363 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -745,14 +745,13 @@ static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx) * * This is equivalent to the HALT instruction. */ -static int acpi_idle_enter_c1(struct cpuidle_device *dev, - int index) +static int acpi_idle_enter_c1(struct cpuidle_device *dev, int index) { ktime_t kt1, kt2; s64 idle_time; struct acpi_processor *pr; - struct cpuidle_state *state = &dev->states[index]; - struct acpi_processor_cx *cx = cpuidle_get_statedata(state); + struct cpuidle_state_usage *state_usage = &dev->states_usage[index]; + struct acpi_processor_cx *cx = cpuidle_get_statedata(state_usage); pr = __this_cpu_read(processors); dev->last_residency = 0; @@ -777,8 +776,8 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev, /* Update device last_residency and state counters*/ dev->last_residency = (int)idle_time; - dev->states[index].time += (unsigned long long)dev->last_residency; - dev->states[index].usage++; + state_usage->time += (unsigned long long)dev->last_residency; + state_usage->usage++; local_irq_enable(); cx->usage++; @@ -792,12 +791,11 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev, * @dev: the target CPU * @index: the index of suggested state */ -static int acpi_idle_enter_simple(struct cpuidle_device *dev, - int index) +static int acpi_idle_enter_simple(struct cpuidle_device *dev, int index) { struct acpi_processor *pr; - struct cpuidle_state *state = &dev->states[index]; - struct acpi_processor_cx *cx = cpuidle_get_statedata(state); + struct cpuidle_state_usage *state_usage = &dev->states_usage[index]; + struct acpi_processor_cx *cx = cpuidle_get_statedata(state_usage); ktime_t kt1, kt2; s64 idle_time_ns; s64 idle_time; @@ -852,8 +850,8 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev, /* Update device last_residency and state counters*/ dev->last_residency = (int)idle_time; - dev->states[index].time += (unsigned long long)dev->last_residency; - dev->states[index].usage++; + state_usage->time += (unsigned long long)dev->last_residency; + state_usage->usage++; /* Tell the scheduler how much we idled: */ sched_clock_idle_wakeup_event(idle_time_ns); @@ -879,12 +877,11 @@ static DEFINE_SPINLOCK(c3_lock); * * If BM is detected, the deepest non-C3 idle state is entered instead. */ -static int acpi_idle_enter_bm(struct cpuidle_device *dev, - int index) +static int acpi_idle_enter_bm(struct cpuidle_device *dev, int index) { struct acpi_processor *pr; - struct cpuidle_state *state = &dev->states[index]; - struct acpi_processor_cx *cx = cpuidle_get_statedata(state); + struct cpuidle_state_usage *state_usage = &dev->states_usage[index]; + struct acpi_processor_cx *cx = cpuidle_get_statedata(state_usage); ktime_t kt1, kt2; s64 idle_time_ns; s64 idle_time; @@ -979,8 +976,8 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev, /* Update device last_residency and state counters*/ dev->last_residency = (int)idle_time; - dev->states[index].time += (unsigned long long)dev->last_residency; - dev->states[index].usage++; + state_usage->time += (unsigned long long)dev->last_residency; + state_usage->usage++; /* Tell the scheduler how much we idled: */ sched_clock_idle_wakeup_event(idle_time_ns); @@ -1010,6 +1007,7 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr) int i, count = CPUIDLE_DRIVER_STATE_START; struct acpi_processor_cx *cx; struct cpuidle_state *state; + struct cpuidle_state_usage *state_usage; struct cpuidle_device *dev = &pr->power.dev; if (!pr->flags.power_setup_done) @@ -1032,6 +1030,7 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr) for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { cx = &pr->power.states[i]; state = &dev->states[count]; + state_usage = &dev->states_usage[count]; if (!cx->valid) continue; @@ -1042,7 +1041,7 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr) !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) continue; #endif - cpuidle_set_statedata(state, cx); + cpuidle_set_statedata(state_usage, cx); snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 92a6216..5d6f98d 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -160,8 +160,9 @@ static int poll_idle(struct cpuidle_device *dev, int index) diff = INT_MAX; dev->last_residency = (int) diff; - dev->states[index].time += (unsigned long long)dev->last_residency; - dev->states[index].usage++; + dev->states_usage[index].time += + (unsigned long long)dev->last_residency; + dev->states_usage[index].usage++; return index; } @@ -169,8 +170,9 @@ static int poll_idle(struct cpuidle_device *dev, int index) static void poll_idle_init(struct cpuidle_device *dev) { struct cpuidle_state *state = &dev->states[0]; + struct cpuidle_state_usage *state_usage = &dev->states_usage[0]; - cpuidle_set_statedata(state, NULL); + cpuidle_set_statedata(state_usage, NULL); snprintf(state->name, CPUIDLE_NAME_LEN, "POLL"); snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE"); @@ -218,8 +220,8 @@ int cpuidle_enable_device(struct cpuidle_device *dev) goto fail_sysfs; for (i = 0; i < dev->state_count; i++) { - dev->states[i].usage = 0; - dev->states[i].time = 0; + dev->states_usage[i].usage = 0; + dev->states_usage[i].time = 0; } dev->last_residency = 0; diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c index be7917e..09c9c77 100644 --- a/drivers/cpuidle/sysfs.c +++ b/drivers/cpuidle/sysfs.c @@ -216,7 +216,7 @@ static struct kobj_type ktype_cpuidle = { struct cpuidle_state_attr { struct attribute attr; - ssize_t (*show)(struct cpuidle_state *, char *); + ssize_t (*show)(struct cpuidle_state *, struct cpuidle_state_usage *, char *); ssize_t (*store)(struct cpuidle_state *, const char *, size_t); }; @@ -224,19 +224,19 @@ struct cpuidle_state_attr { static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL) #define define_show_state_function(_name) \ -static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \ +static ssize_t show_state_##_name(struct cpuidle_state *state, struct cpuidle_state_usage *state_usage, char *buf) \ { \ return sprintf(buf, "%u\n", state->_name);\ } #define define_show_state_ull_function(_name) \ -static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \ +static ssize_t show_state_##_name(struct cpuidle_state *state, struct cpuidle_state_usage *state_usage, char *buf) \ { \ - return sprintf(buf, "%llu\n", state->_name);\ + return sprintf(buf, "%llu\n", state_usage->_name);\ } #define define_show_state_str_function(_name) \ -static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \ +static ssize_t show_state_##_name(struct cpuidle_state *state, struct cpuidle_state_usage *state_usage, char *buf) \ { \ if (state->_name[0] == '\0')\ return sprintf(buf, "\n");\ @@ -269,16 +269,18 @@ static struct attribute *cpuidle_state_default_attrs[] = { #define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj) #define kobj_to_state(k) (kobj_to_state_obj(k)->state) +#define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage) #define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr) static ssize_t cpuidle_state_show(struct kobject * kobj, struct attribute * attr ,char * buf) { 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->show) - ret = cattr->show(state, buf); + ret = cattr->show(state, state_usage, buf); return ret; } @@ -323,6 +325,7 @@ int cpuidle_add_state_sysfs(struct cpuidle_device *device) if (!kobj) goto error_state; kobj->state = &device->states[i]; + kobj->state_usage = &device->states_usage[i]; init_completion(&kobj->kobj_unregister); ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, &device->kobj, diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index a3306be..5a1a238 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -28,19 +28,22 @@ struct cpuidle_device; * CPUIDLE DEVICE INTERFACE * ****************************/ +struct cpuidle_state_usage { + void *driver_data; + + unsigned long long usage; + unsigned long long time; /* in US */ +}; + struct cpuidle_state { char name[CPUIDLE_NAME_LEN]; char desc[CPUIDLE_DESC_LEN]; - void *driver_data; unsigned int flags; unsigned int exit_latency; /* in US */ unsigned int power_usage; /* in mW */ unsigned int target_residency; /* in US */ - unsigned long long usage; - unsigned long long time; /* in US */ - int (*enter) (struct cpuidle_device *dev, int index); }; @@ -52,26 +55,27 @@ struct cpuidle_state { /** * cpuidle_get_statedata - retrieves private driver state data - * @state: the state + * @st_usage: the state usage statistics */ -static inline void * cpuidle_get_statedata(struct cpuidle_state *state) +static inline void *cpuidle_get_statedata(struct cpuidle_state_usage *st_usage) { - return state->driver_data; + return st_usage->driver_data; } /** * cpuidle_set_statedata - stores private driver state data - * @state: the state + * @st_usage: the state usage statistics * @data: the private data */ static inline void -cpuidle_set_statedata(struct cpuidle_state *state, void *data) +cpuidle_set_statedata(struct cpuidle_state_usage *st_usage, void *data) { - state->driver_data = data; + st_usage->driver_data = data; } struct cpuidle_state_kobj { struct cpuidle_state *state; + struct cpuidle_state_usage *state_usage; struct completion kobj_unregister; struct kobject kobj; }; @@ -85,6 +89,7 @@ struct cpuidle_device { int last_residency; int state_count; struct cpuidle_state states[CPUIDLE_STATE_MAX]; + struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX]; struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX]; struct list_head device_list; -- 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/