From 6c19da3578bc0ae0d3a65560b7ac7963a35ea79c Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Mon, 28 Nov 2011 07:42:19 -0500 Subject: [PATCH] lttng: dynamically selectable context information Events can be augmented with context information. This is dynamically configurable from the command line. Signed-off-by: Mathieu Desnoyers Signed-off-by: Greg Kroah-Hartman --- drivers/staging/lttng/ltt-context.c | 93 ++++++ drivers/staging/lttng/lttng-context-nice.c | 68 +++++ .../lttng/lttng-context-perf-counters.c | 271 ++++++++++++++++++ drivers/staging/lttng/lttng-context-pid.c | 68 +++++ drivers/staging/lttng/lttng-context-ppid.c | 71 +++++ drivers/staging/lttng/lttng-context-prio.c | 89 ++++++ .../staging/lttng/lttng-context-procname.c | 72 +++++ drivers/staging/lttng/lttng-context-tid.c | 68 +++++ drivers/staging/lttng/lttng-context-vpid.c | 74 +++++ drivers/staging/lttng/lttng-context-vppid.c | 79 +++++ drivers/staging/lttng/lttng-context-vtid.c | 74 +++++ 11 files changed, 1027 insertions(+) create mode 100644 drivers/staging/lttng/ltt-context.c create mode 100644 drivers/staging/lttng/lttng-context-nice.c create mode 100644 drivers/staging/lttng/lttng-context-perf-counters.c create mode 100644 drivers/staging/lttng/lttng-context-pid.c create mode 100644 drivers/staging/lttng/lttng-context-ppid.c create mode 100644 drivers/staging/lttng/lttng-context-prio.c create mode 100644 drivers/staging/lttng/lttng-context-procname.c create mode 100644 drivers/staging/lttng/lttng-context-tid.c create mode 100644 drivers/staging/lttng/lttng-context-vpid.c create mode 100644 drivers/staging/lttng/lttng-context-vppid.c create mode 100644 drivers/staging/lttng/lttng-context-vtid.c diff --git a/drivers/staging/lttng/ltt-context.c b/drivers/staging/lttng/ltt-context.c new file mode 100644 index 00000000000..60ea525bb3e --- /dev/null +++ b/drivers/staging/lttng/ltt-context.c @@ -0,0 +1,93 @@ +/* + * ltt-context.c + * + * Copyright 2011 (c) - Mathieu Desnoyers + * + * LTTng trace/channel/event context management. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include +#include +#include +#include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ +#include "ltt-events.h" +#include "ltt-tracer.h" + +int lttng_find_context(struct lttng_ctx *ctx, const char *name) +{ + unsigned int i; + + for (i = 0; i < ctx->nr_fields; i++) { + /* Skip allocated (but non-initialized) contexts */ + if (!ctx->fields[i].event_field.name) + continue; + if (!strcmp(ctx->fields[i].event_field.name, name)) + return 1; + } + return 0; +} +EXPORT_SYMBOL_GPL(lttng_find_context); + +/* + * Note: as we append context information, the pointer location may change. + */ +struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p) +{ + struct lttng_ctx_field *field; + struct lttng_ctx *ctx; + + if (!*ctx_p) { + *ctx_p = kzalloc(sizeof(struct lttng_ctx), GFP_KERNEL); + if (!*ctx_p) + return NULL; + } + ctx = *ctx_p; + if (ctx->nr_fields + 1 > ctx->allocated_fields) { + struct lttng_ctx_field *new_fields; + + ctx->allocated_fields = max_t(size_t, 1, 2 * ctx->allocated_fields); + new_fields = kzalloc(ctx->allocated_fields * sizeof(struct lttng_ctx_field), GFP_KERNEL); + if (!new_fields) + return NULL; + if (ctx->fields) + memcpy(new_fields, ctx->fields, sizeof(*ctx->fields) * ctx->nr_fields); + kfree(ctx->fields); + ctx->fields = new_fields; + } + field = &ctx->fields[ctx->nr_fields]; + ctx->nr_fields++; + return field; +} +EXPORT_SYMBOL_GPL(lttng_append_context); + +/* + * Remove last context field. + */ +void lttng_remove_context_field(struct lttng_ctx **ctx_p, + struct lttng_ctx_field *field) +{ + struct lttng_ctx *ctx; + + ctx = *ctx_p; + ctx->nr_fields--; + WARN_ON_ONCE(&ctx->fields[ctx->nr_fields] != field); + memset(&ctx->fields[ctx->nr_fields], 0, sizeof(struct lttng_ctx_field)); +} +EXPORT_SYMBOL_GPL(lttng_remove_context_field); + +void lttng_destroy_context(struct lttng_ctx *ctx) +{ + int i; + + if (!ctx) + return; + for (i = 0; i < ctx->nr_fields; i++) { + if (ctx->fields[i].destroy) + ctx->fields[i].destroy(&ctx->fields[i]); + } + kfree(ctx->fields); + kfree(ctx); +} diff --git a/drivers/staging/lttng/lttng-context-nice.c b/drivers/staging/lttng/lttng-context-nice.c new file mode 100644 index 00000000000..9b99b549246 --- /dev/null +++ b/drivers/staging/lttng/lttng-context-nice.c @@ -0,0 +1,68 @@ +/* + * (C) Copyright 2009-2011 - + * Mathieu Desnoyers + * + * LTTng nice context. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include +#include +#include "ltt-events.h" +#include "wrapper/ringbuffer/frontend_types.h" +#include "wrapper/vmalloc.h" +#include "ltt-tracer.h" + +static +size_t nice_get_size(size_t offset) +{ + size_t size = 0; + + size += lib_ring_buffer_align(offset, ltt_alignof(int)); + size += sizeof(int); + return size; +} + +static +void nice_record(struct lttng_ctx_field *field, + struct lib_ring_buffer_ctx *ctx, + struct ltt_channel *chan) +{ + int nice; + + nice = task_nice(current); + lib_ring_buffer_align_ctx(ctx, ltt_alignof(nice)); + chan->ops->event_write(ctx, &nice, sizeof(nice)); +} + +int lttng_add_nice_to_ctx(struct lttng_ctx **ctx) +{ + struct lttng_ctx_field *field; + + field = lttng_append_context(ctx); + if (!field) + return -ENOMEM; + if (lttng_find_context(*ctx, "nice")) { + lttng_remove_context_field(ctx, field); + return -EEXIST; + } + field->event_field.name = "nice"; + field->event_field.type.atype = atype_integer; + field->event_field.type.u.basic.integer.size = sizeof(int) * CHAR_BIT; + field->event_field.type.u.basic.integer.alignment = ltt_alignof(int) * CHAR_BIT; + field->event_field.type.u.basic.integer.signedness = is_signed_type(int); + field->event_field.type.u.basic.integer.reverse_byte_order = 0; + field->event_field.type.u.basic.integer.base = 10; + field->event_field.type.u.basic.integer.encoding = lttng_encode_none; + field->get_size = nice_get_size; + field->record = nice_record; + wrapper_vmalloc_sync_all(); + return 0; +} +EXPORT_SYMBOL_GPL(lttng_add_nice_to_ctx); + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("Linux Trace Toolkit Nice Context"); diff --git a/drivers/staging/lttng/lttng-context-perf-counters.c b/drivers/staging/lttng/lttng-context-perf-counters.c new file mode 100644 index 00000000000..3ae2266f948 --- /dev/null +++ b/drivers/staging/lttng/lttng-context-perf-counters.c @@ -0,0 +1,271 @@ +/* + * (C) Copyright 2009-2011 - + * Mathieu Desnoyers + * + * LTTng performance monitoring counters (perf-counters) integration module. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include +#include +#include +#include +#include "ltt-events.h" +#include "wrapper/ringbuffer/frontend_types.h" +#include "wrapper/vmalloc.h" +#include "wrapper/perf.h" +#include "ltt-tracer.h" + +static +size_t perf_counter_get_size(size_t offset) +{ + size_t size = 0; + + size += lib_ring_buffer_align(offset, ltt_alignof(uint64_t)); + size += sizeof(uint64_t); + return size; +} + +static +void perf_counter_record(struct lttng_ctx_field *field, + struct lib_ring_buffer_ctx *ctx, + struct ltt_channel *chan) +{ + struct perf_event *event; + uint64_t value; + + event = field->u.perf_counter->e[ctx->cpu]; + if (likely(event)) { + if (unlikely(event->state == PERF_EVENT_STATE_ERROR)) { + value = 0; + } else { + event->pmu->read(event); + value = local64_read(&event->count); + } + } else { + /* + * Perf chooses not to be clever and not to support enabling a + * perf counter before the cpu is brought up. Therefore, we need + * to support having events coming (e.g. scheduler events) + * before the counter is setup. Write an arbitrary 0 in this + * case. + */ + value = 0; + } + lib_ring_buffer_align_ctx(ctx, ltt_alignof(value)); + chan->ops->event_write(ctx, &value, sizeof(value)); +} + +#if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,99)) +static +void overflow_callback(struct perf_event *event, + struct perf_sample_data *data, + struct pt_regs *regs) +{ +} +#else +static +void overflow_callback(struct perf_event *event, int nmi, + struct perf_sample_data *data, + struct pt_regs *regs) +{ +} +#endif + +static +void lttng_destroy_perf_counter_field(struct lttng_ctx_field *field) +{ + struct perf_event **events = field->u.perf_counter->e; + int cpu; + + get_online_cpus(); + for_each_online_cpu(cpu) + perf_event_release_kernel(events[cpu]); + put_online_cpus(); +#ifdef CONFIG_HOTPLUG_CPU + unregister_cpu_notifier(&field->u.perf_counter->nb); +#endif + kfree(field->event_field.name); + kfree(field->u.perf_counter->attr); + kfree(events); + kfree(field->u.perf_counter); +} + +#ifdef CONFIG_HOTPLUG_CPU + +/** + * lttng_perf_counter_hp_callback - CPU hotplug callback + * @nb: notifier block + * @action: hotplug action to take + * @hcpu: CPU number + * + * Returns the success/failure of the operation. (%NOTIFY_OK, %NOTIFY_BAD) + * + * We can setup perf counters when the cpu is online (up prepare seems to be too + * soon). + */ +static +int __cpuinit lttng_perf_counter_cpu_hp_callback(struct notifier_block *nb, + unsigned long action, + void *hcpu) +{ + unsigned int cpu = (unsigned long) hcpu; + struct lttng_perf_counter_field *perf_field = + container_of(nb, struct lttng_perf_counter_field, nb); + struct perf_event **events = perf_field->e; + struct perf_event_attr *attr = perf_field->attr; + struct perf_event *pevent; + + if (!perf_field->hp_enable) + return NOTIFY_OK; + + switch (action) { + case CPU_ONLINE: + case CPU_ONLINE_FROZEN: + pevent = wrapper_perf_event_create_kernel_counter(attr, + cpu, NULL, overflow_callback); + if (!pevent || IS_ERR(pevent)) + return NOTIFY_BAD; + if (pevent->state == PERF_EVENT_STATE_ERROR) { + perf_event_release_kernel(pevent); + return NOTIFY_BAD; + } + barrier(); /* Create perf counter before setting event */ + events[cpu] = pevent; + break; + case CPU_UP_CANCELED: + case CPU_UP_CANCELED_FROZEN: + case CPU_DEAD: + case CPU_DEAD_FROZEN: + pevent = events[cpu]; + events[cpu] = NULL; + barrier(); /* NULLify event before perf counter teardown */ + perf_event_release_kernel(pevent); + break; + } + return NOTIFY_OK; +} + +#endif + +int lttng_add_perf_counter_to_ctx(uint32_t type, + uint64_t config, + const char *name, + struct lttng_ctx **ctx) +{ + struct lttng_ctx_field *field; + struct lttng_perf_counter_field *perf_field; + struct perf_event **events; + struct perf_event_attr *attr; + int ret; + int cpu; + char *name_alloc; + + events = kzalloc(num_possible_cpus() * sizeof(*events), GFP_KERNEL); + if (!events) + return -ENOMEM; + + attr = kzalloc(sizeof(struct perf_event_attr), GFP_KERNEL); + if (!attr) { + ret = -ENOMEM; + goto error_attr; + } + + attr->type = type; + attr->config = config; + attr->size = sizeof(struct perf_event_attr); + attr->pinned = 1; + attr->disabled = 0; + + perf_field = kzalloc(sizeof(struct lttng_perf_counter_field), GFP_KERNEL); + if (!perf_field) { + ret = -ENOMEM; + goto error_alloc_perf_field; + } + perf_field->e = events; + perf_field->attr = attr; + + name_alloc = kstrdup(name, GFP_KERNEL); + if (!name_alloc) { + ret = -ENOMEM; + goto name_alloc_error; + } + + field = lttng_append_context(ctx); + if (!field) { + ret = -ENOMEM; + goto append_context_error; + } + if (lttng_find_context(*ctx, name_alloc)) { + ret = -EEXIST; + goto find_error; + } + +#ifdef CONFIG_HOTPLUG_CPU + perf_field->nb.notifier_call = + lttng_perf_counter_cpu_hp_callback; + perf_field->nb.priority = 0; + register_cpu_notifier(&perf_field->nb); +#endif + + get_online_cpus(); + for_each_online_cpu(cpu) { + events[cpu] = wrapper_perf_event_create_kernel_counter(attr, + cpu, NULL, overflow_callback); + if (!events[cpu] || IS_ERR(events[cpu])) { + ret = -EINVAL; + goto counter_error; + } + if (events[cpu]->state == PERF_EVENT_STATE_ERROR) { + ret = -EBUSY; + goto counter_busy; + } + } + put_online_cpus(); + + field->destroy = lttng_destroy_perf_counter_field; + + field->event_field.name = name_alloc; + field->event_field.type.atype = atype_integer; + field->event_field.type.u.basic.integer.size = sizeof(uint64_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.alignment = ltt_alignof(uint64_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.signedness = is_signed_type(uint64_t); + field->event_field.type.u.basic.integer.reverse_byte_order = 0; + field->event_field.type.u.basic.integer.base = 10; + field->event_field.type.u.basic.integer.encoding = lttng_encode_none; + field->get_size = perf_counter_get_size; + field->record = perf_counter_record; + field->u.perf_counter = perf_field; + perf_field->hp_enable = 1; + + wrapper_vmalloc_sync_all(); + return 0; + +counter_busy: +counter_error: + for_each_online_cpu(cpu) { + if (events[cpu] && !IS_ERR(events[cpu])) + perf_event_release_kernel(events[cpu]); + } + put_online_cpus(); +#ifdef CONFIG_HOTPLUG_CPU + unregister_cpu_notifier(&perf_field->nb); +#endif +find_error: + lttng_remove_context_field(ctx, field); +append_context_error: + kfree(name_alloc); +name_alloc_error: + kfree(perf_field); +error_alloc_perf_field: + kfree(attr); +error_attr: + kfree(events); + return ret; +} + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("Linux Trace Toolkit Perf Support"); diff --git a/drivers/staging/lttng/lttng-context-pid.c b/drivers/staging/lttng/lttng-context-pid.c new file mode 100644 index 00000000000..698b242245a --- /dev/null +++ b/drivers/staging/lttng/lttng-context-pid.c @@ -0,0 +1,68 @@ +/* + * (C) Copyright 2009-2011 - + * Mathieu Desnoyers + * + * LTTng PID context. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include +#include +#include "ltt-events.h" +#include "wrapper/ringbuffer/frontend_types.h" +#include "wrapper/vmalloc.h" +#include "ltt-tracer.h" + +static +size_t pid_get_size(size_t offset) +{ + size_t size = 0; + + size += lib_ring_buffer_align(offset, ltt_alignof(pid_t)); + size += sizeof(pid_t); + return size; +} + +static +void pid_record(struct lttng_ctx_field *field, + struct lib_ring_buffer_ctx *ctx, + struct ltt_channel *chan) +{ + pid_t pid; + + pid = task_tgid_nr(current); + lib_ring_buffer_align_ctx(ctx, ltt_alignof(pid)); + chan->ops->event_write(ctx, &pid, sizeof(pid)); +} + +int lttng_add_pid_to_ctx(struct lttng_ctx **ctx) +{ + struct lttng_ctx_field *field; + + field = lttng_append_context(ctx); + if (!field) + return -ENOMEM; + if (lttng_find_context(*ctx, "pid")) { + lttng_remove_context_field(ctx, field); + return -EEXIST; + } + field->event_field.name = "pid"; + field->event_field.type.atype = atype_integer; + field->event_field.type.u.basic.integer.size = sizeof(pid_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.alignment = ltt_alignof(pid_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.signedness = is_signed_type(pid_t); + field->event_field.type.u.basic.integer.reverse_byte_order = 0; + field->event_field.type.u.basic.integer.base = 10; + field->event_field.type.u.basic.integer.encoding = lttng_encode_none; + field->get_size = pid_get_size; + field->record = pid_record; + wrapper_vmalloc_sync_all(); + return 0; +} +EXPORT_SYMBOL_GPL(lttng_add_pid_to_ctx); + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("Linux Trace Toolkit PID Context"); diff --git a/drivers/staging/lttng/lttng-context-ppid.c b/drivers/staging/lttng/lttng-context-ppid.c new file mode 100644 index 00000000000..738f7e6882d --- /dev/null +++ b/drivers/staging/lttng/lttng-context-ppid.c @@ -0,0 +1,71 @@ +/* + * (C) Copyright 2009-2011 - + * Mathieu Desnoyers + * + * LTTng PPID context. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include +#include +#include +#include "ltt-events.h" +#include "wrapper/ringbuffer/frontend_types.h" +#include "wrapper/vmalloc.h" +#include "ltt-tracer.h" + +static +size_t ppid_get_size(size_t offset) +{ + size_t size = 0; + + size += lib_ring_buffer_align(offset, ltt_alignof(pid_t)); + size += sizeof(pid_t); + return size; +} + +static +void ppid_record(struct lttng_ctx_field *field, + struct lib_ring_buffer_ctx *ctx, + struct ltt_channel *chan) +{ + pid_t ppid; + + rcu_read_lock(); + ppid = task_tgid_nr(current->real_parent); + rcu_read_unlock(); + lib_ring_buffer_align_ctx(ctx, ltt_alignof(ppid)); + chan->ops->event_write(ctx, &ppid, sizeof(ppid)); +} + +int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx) +{ + struct lttng_ctx_field *field; + + field = lttng_append_context(ctx); + if (!field) + return -ENOMEM; + if (lttng_find_context(*ctx, "ppid")) { + lttng_remove_context_field(ctx, field); + return -EEXIST; + } + field->event_field.name = "ppid"; + field->event_field.type.atype = atype_integer; + field->event_field.type.u.basic.integer.size = sizeof(pid_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.alignment = ltt_alignof(pid_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.signedness = is_signed_type(pid_t); + field->event_field.type.u.basic.integer.reverse_byte_order = 0; + field->event_field.type.u.basic.integer.base = 10; + field->event_field.type.u.basic.integer.encoding = lttng_encode_none; + field->get_size = ppid_get_size; + field->record = ppid_record; + wrapper_vmalloc_sync_all(); + return 0; +} +EXPORT_SYMBOL_GPL(lttng_add_ppid_to_ctx); + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("Linux Trace Toolkit PPID Context"); diff --git a/drivers/staging/lttng/lttng-context-prio.c b/drivers/staging/lttng/lttng-context-prio.c new file mode 100644 index 00000000000..1ee3a54daf2 --- /dev/null +++ b/drivers/staging/lttng/lttng-context-prio.c @@ -0,0 +1,89 @@ +/* + * (C) Copyright 2009-2011 - + * Mathieu Desnoyers + * + * LTTng priority context. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include +#include +#include "ltt-events.h" +#include "wrapper/ringbuffer/frontend_types.h" +#include "wrapper/vmalloc.h" +#include "wrapper/kallsyms.h" +#include "ltt-tracer.h" + +static +int (*wrapper_task_prio_sym)(struct task_struct *t); + +int wrapper_task_prio_init(void) +{ + wrapper_task_prio_sym = (void *) kallsyms_lookup_funcptr("task_prio"); + if (!wrapper_task_prio_sym) { + printk(KERN_WARNING "LTTng: task_prio symbol lookup failed.\n"); + return -EINVAL; + } + return 0; +} + +static +size_t prio_get_size(size_t offset) +{ + size_t size = 0; + + size += lib_ring_buffer_align(offset, ltt_alignof(int)); + size += sizeof(int); + return size; +} + +static +void prio_record(struct lttng_ctx_field *field, + struct lib_ring_buffer_ctx *ctx, + struct ltt_channel *chan) +{ + int prio; + + prio = wrapper_task_prio_sym(current); + lib_ring_buffer_align_ctx(ctx, ltt_alignof(prio)); + chan->ops->event_write(ctx, &prio, sizeof(prio)); +} + +int lttng_add_prio_to_ctx(struct lttng_ctx **ctx) +{ + struct lttng_ctx_field *field; + int ret; + + if (!wrapper_task_prio_sym) { + ret = wrapper_task_prio_init(); + if (ret) + return ret; + } + + field = lttng_append_context(ctx); + if (!field) + return -ENOMEM; + if (lttng_find_context(*ctx, "prio")) { + lttng_remove_context_field(ctx, field); + return -EEXIST; + } + field->event_field.name = "prio"; + field->event_field.type.atype = atype_integer; + field->event_field.type.u.basic.integer.size = sizeof(int) * CHAR_BIT; + field->event_field.type.u.basic.integer.alignment = ltt_alignof(int) * CHAR_BIT; + field->event_field.type.u.basic.integer.signedness = is_signed_type(int); + field->event_field.type.u.basic.integer.reverse_byte_order = 0; + field->event_field.type.u.basic.integer.base = 10; + field->event_field.type.u.basic.integer.encoding = lttng_encode_none; + field->get_size = prio_get_size; + field->record = prio_record; + wrapper_vmalloc_sync_all(); + return 0; +} +EXPORT_SYMBOL_GPL(lttng_add_prio_to_ctx); + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("Linux Trace Toolkit Priority Context"); diff --git a/drivers/staging/lttng/lttng-context-procname.c b/drivers/staging/lttng/lttng-context-procname.c new file mode 100644 index 00000000000..c6bc6468004 --- /dev/null +++ b/drivers/staging/lttng/lttng-context-procname.c @@ -0,0 +1,72 @@ +/* + * (C) Copyright 2009-2011 - + * Mathieu Desnoyers + * + * LTTng procname context. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include +#include +#include "ltt-events.h" +#include "wrapper/ringbuffer/frontend_types.h" +#include "wrapper/vmalloc.h" +#include "ltt-tracer.h" + +static +size_t procname_get_size(size_t offset) +{ + size_t size = 0; + + size += sizeof(current->comm); + return size; +} + +/* + * Racy read of procname. We simply copy its whole array size. + * Races with /proc//procname write only. + * Otherwise having to take a mutex for each event is cumbersome and + * could lead to crash in IRQ context and deadlock of the lockdep tracer. + */ +static +void procname_record(struct lttng_ctx_field *field, + struct lib_ring_buffer_ctx *ctx, + struct ltt_channel *chan) +{ + chan->ops->event_write(ctx, current->comm, sizeof(current->comm)); +} + +int lttng_add_procname_to_ctx(struct lttng_ctx **ctx) +{ + struct lttng_ctx_field *field; + + field = lttng_append_context(ctx); + if (!field) + return -ENOMEM; + if (lttng_find_context(*ctx, "procname")) { + lttng_remove_context_field(ctx, field); + return -EEXIST; + } + field->event_field.name = "procname"; + field->event_field.type.atype = atype_array; + field->event_field.type.u.array.elem_type.atype = atype_integer; + field->event_field.type.u.array.elem_type.u.basic.integer.size = sizeof(char) * CHAR_BIT; + field->event_field.type.u.array.elem_type.u.basic.integer.alignment = ltt_alignof(char) * CHAR_BIT; + field->event_field.type.u.array.elem_type.u.basic.integer.signedness = is_signed_type(char); + field->event_field.type.u.array.elem_type.u.basic.integer.reverse_byte_order = 0; + field->event_field.type.u.array.elem_type.u.basic.integer.base = 10; + field->event_field.type.u.array.elem_type.u.basic.integer.encoding = lttng_encode_UTF8; + field->event_field.type.u.array.length = sizeof(current->comm); + + field->get_size = procname_get_size; + field->record = procname_record; + wrapper_vmalloc_sync_all(); + return 0; +} +EXPORT_SYMBOL_GPL(lttng_add_procname_to_ctx); + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("Linux Trace Toolkit Perf Support"); diff --git a/drivers/staging/lttng/lttng-context-tid.c b/drivers/staging/lttng/lttng-context-tid.c new file mode 100644 index 00000000000..d5ccdb635c4 --- /dev/null +++ b/drivers/staging/lttng/lttng-context-tid.c @@ -0,0 +1,68 @@ +/* + * (C) Copyright 2009-2011 - + * Mathieu Desnoyers + * + * LTTng TID context. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include +#include +#include "ltt-events.h" +#include "wrapper/ringbuffer/frontend_types.h" +#include "wrapper/vmalloc.h" +#include "ltt-tracer.h" + +static +size_t tid_get_size(size_t offset) +{ + size_t size = 0; + + size += lib_ring_buffer_align(offset, ltt_alignof(pid_t)); + size += sizeof(pid_t); + return size; +} + +static +void tid_record(struct lttng_ctx_field *field, + struct lib_ring_buffer_ctx *ctx, + struct ltt_channel *chan) +{ + pid_t tid; + + tid = task_pid_nr(current); + lib_ring_buffer_align_ctx(ctx, ltt_alignof(tid)); + chan->ops->event_write(ctx, &tid, sizeof(tid)); +} + +int lttng_add_tid_to_ctx(struct lttng_ctx **ctx) +{ + struct lttng_ctx_field *field; + + field = lttng_append_context(ctx); + if (!field) + return -ENOMEM; + if (lttng_find_context(*ctx, "tid")) { + lttng_remove_context_field(ctx, field); + return -EEXIST; + } + field->event_field.name = "tid"; + field->event_field.type.atype = atype_integer; + field->event_field.type.u.basic.integer.size = sizeof(pid_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.alignment = ltt_alignof(pid_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.signedness = is_signed_type(pid_t); + field->event_field.type.u.basic.integer.reverse_byte_order = 0; + field->event_field.type.u.basic.integer.base = 10; + field->event_field.type.u.basic.integer.encoding = lttng_encode_none; + field->get_size = tid_get_size; + field->record = tid_record; + wrapper_vmalloc_sync_all(); + return 0; +} +EXPORT_SYMBOL_GPL(lttng_add_tid_to_ctx); + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("Linux Trace Toolkit TID Context"); diff --git a/drivers/staging/lttng/lttng-context-vpid.c b/drivers/staging/lttng/lttng-context-vpid.c new file mode 100644 index 00000000000..3f16e03a6d9 --- /dev/null +++ b/drivers/staging/lttng/lttng-context-vpid.c @@ -0,0 +1,74 @@ +/* + * (C) Copyright 2009-2011 - + * Mathieu Desnoyers + * + * LTTng vPID context. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include +#include +#include "ltt-events.h" +#include "wrapper/ringbuffer/frontend_types.h" +#include "wrapper/vmalloc.h" +#include "ltt-tracer.h" + +static +size_t vpid_get_size(size_t offset) +{ + size_t size = 0; + + size += lib_ring_buffer_align(offset, ltt_alignof(pid_t)); + size += sizeof(pid_t); + return size; +} + +static +void vpid_record(struct lttng_ctx_field *field, + struct lib_ring_buffer_ctx *ctx, + struct ltt_channel *chan) +{ + pid_t vpid; + + /* + * nsproxy can be NULL when scheduled out of exit. + */ + if (!current->nsproxy) + vpid = 0; + else + vpid = task_tgid_vnr(current); + lib_ring_buffer_align_ctx(ctx, ltt_alignof(vpid)); + chan->ops->event_write(ctx, &vpid, sizeof(vpid)); +} + +int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx) +{ + struct lttng_ctx_field *field; + + field = lttng_append_context(ctx); + if (!field) + return -ENOMEM; + if (lttng_find_context(*ctx, "vpid")) { + lttng_remove_context_field(ctx, field); + return -EEXIST; + } + field->event_field.name = "vpid"; + field->event_field.type.atype = atype_integer; + field->event_field.type.u.basic.integer.size = sizeof(pid_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.alignment = ltt_alignof(pid_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.signedness = is_signed_type(pid_t); + field->event_field.type.u.basic.integer.reverse_byte_order = 0; + field->event_field.type.u.basic.integer.base = 10; + field->event_field.type.u.basic.integer.encoding = lttng_encode_none; + field->get_size = vpid_get_size; + field->record = vpid_record; + wrapper_vmalloc_sync_all(); + return 0; +} +EXPORT_SYMBOL_GPL(lttng_add_vpid_to_ctx); + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("Linux Trace Toolkit vPID Context"); diff --git a/drivers/staging/lttng/lttng-context-vppid.c b/drivers/staging/lttng/lttng-context-vppid.c new file mode 100644 index 00000000000..f01b02068d6 --- /dev/null +++ b/drivers/staging/lttng/lttng-context-vppid.c @@ -0,0 +1,79 @@ +/* + * (C) Copyright 2009-2011 - + * Mathieu Desnoyers + * + * LTTng vPPID context. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include +#include +#include +#include "ltt-events.h" +#include "wrapper/ringbuffer/frontend_types.h" +#include "wrapper/vmalloc.h" +#include "ltt-tracer.h" + +static +size_t vppid_get_size(size_t offset) +{ + size_t size = 0; + + size += lib_ring_buffer_align(offset, ltt_alignof(pid_t)); + size += sizeof(pid_t); + return size; +} + +static +void vppid_record(struct lttng_ctx_field *field, + struct lib_ring_buffer_ctx *ctx, + struct ltt_channel *chan) +{ + struct task_struct *parent; + pid_t vppid; + + /* + * nsproxy can be NULL when scheduled out of exit. + */ + rcu_read_lock(); + parent = rcu_dereference(current->real_parent); + if (!parent->nsproxy) + vppid = 0; + else + vppid = task_tgid_vnr(parent); + rcu_read_unlock(); + lib_ring_buffer_align_ctx(ctx, ltt_alignof(vppid)); + chan->ops->event_write(ctx, &vppid, sizeof(vppid)); +} + +int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx) +{ + struct lttng_ctx_field *field; + + field = lttng_append_context(ctx); + if (!field) + return -ENOMEM; + if (lttng_find_context(*ctx, "vppid")) { + lttng_remove_context_field(ctx, field); + return -EEXIST; + } + field->event_field.name = "vppid"; + field->event_field.type.atype = atype_integer; + field->event_field.type.u.basic.integer.size = sizeof(pid_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.alignment = ltt_alignof(pid_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.signedness = is_signed_type(pid_t); + field->event_field.type.u.basic.integer.reverse_byte_order = 0; + field->event_field.type.u.basic.integer.base = 10; + field->event_field.type.u.basic.integer.encoding = lttng_encode_none; + field->get_size = vppid_get_size; + field->record = vppid_record; + wrapper_vmalloc_sync_all(); + return 0; +} +EXPORT_SYMBOL_GPL(lttng_add_vppid_to_ctx); + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("Linux Trace Toolkit vPPID Context"); diff --git a/drivers/staging/lttng/lttng-context-vtid.c b/drivers/staging/lttng/lttng-context-vtid.c new file mode 100644 index 00000000000..264bbb3011d --- /dev/null +++ b/drivers/staging/lttng/lttng-context-vtid.c @@ -0,0 +1,74 @@ +/* + * (C) Copyright 2009-2011 - + * Mathieu Desnoyers + * + * LTTng vTID context. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include +#include +#include "ltt-events.h" +#include "wrapper/ringbuffer/frontend_types.h" +#include "wrapper/vmalloc.h" +#include "ltt-tracer.h" + +static +size_t vtid_get_size(size_t offset) +{ + size_t size = 0; + + size += lib_ring_buffer_align(offset, ltt_alignof(pid_t)); + size += sizeof(pid_t); + return size; +} + +static +void vtid_record(struct lttng_ctx_field *field, + struct lib_ring_buffer_ctx *ctx, + struct ltt_channel *chan) +{ + pid_t vtid; + + /* + * nsproxy can be NULL when scheduled out of exit. + */ + if (!current->nsproxy) + vtid = 0; + else + vtid = task_pid_vnr(current); + lib_ring_buffer_align_ctx(ctx, ltt_alignof(vtid)); + chan->ops->event_write(ctx, &vtid, sizeof(vtid)); +} + +int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx) +{ + struct lttng_ctx_field *field; + + field = lttng_append_context(ctx); + if (!field) + return -ENOMEM; + if (lttng_find_context(*ctx, "vtid")) { + lttng_remove_context_field(ctx, field); + return -EEXIST; + } + field->event_field.name = "vtid"; + field->event_field.type.atype = atype_integer; + field->event_field.type.u.basic.integer.size = sizeof(pid_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.alignment = ltt_alignof(pid_t) * CHAR_BIT; + field->event_field.type.u.basic.integer.signedness = is_signed_type(pid_t); + field->event_field.type.u.basic.integer.reverse_byte_order = 0; + field->event_field.type.u.basic.integer.base = 10; + field->event_field.type.u.basic.integer.encoding = lttng_encode_none; + field->get_size = vtid_get_size; + field->record = vtid_record; + wrapper_vmalloc_sync_all(); + return 0; +} +EXPORT_SYMBOL_GPL(lttng_add_vtid_to_ctx); + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("Linux Trace Toolkit vTID Context"); -- 2.46.0