diff options
Diffstat (limited to 'drivers/oprofile')
-rw-r--r-- | drivers/oprofile/buffer_sync.c | 42 | ||||
-rw-r--r-- | drivers/oprofile/cpu_buffer.c | 139 | ||||
-rw-r--r-- | drivers/oprofile/cpu_buffer.h | 12 |
3 files changed, 102 insertions, 91 deletions
diff --git a/drivers/oprofile/buffer_sync.c b/drivers/oprofile/buffer_sync.c index 908202afb..d969bb1 100644 --- a/drivers/oprofile/buffer_sync.c +++ b/drivers/oprofile/buffer_sync.c @@ -1,11 +1,12 @@ /** * @file buffer_sync.c * - * @remark Copyright 2002 OProfile authors + * @remark Copyright 2002-2009 OProfile authors * @remark Read the file COPYING * * @author John Levon <levon@movementarian.org> * @author Barry Kasindorf + * @author Robert Richter <robert.richter@amd.com> * * This is the core of the buffer management. Each * CPU buffer is processed and entered into the @@ -529,6 +530,7 @@ void sync_buffer(int cpu) sync_buffer_state state = sb_buffer_start; unsigned int i; unsigned long available; + unsigned long flags; struct op_entry entry; struct op_sample *sample; @@ -545,38 +547,34 @@ void sync_buffer(int cpu) break; if (is_code(sample->eip)) { - switch (sample->event) { - case 0: - case CPU_IS_KERNEL: + flags = sample->event; + if (flags & TRACE_BEGIN) { + state = sb_bt_start; + add_trace_begin(); + } + if (flags & KERNEL_CTX_SWITCH) { /* kernel/userspace switch */ - in_kernel = sample->event; + in_kernel = flags & IS_KERNEL; if (state == sb_buffer_start) state = sb_sample_start; - add_kernel_ctx_switch(sample->event); - break; - case CPU_TRACE_BEGIN: - state = sb_bt_start; - add_trace_begin(); - break; -#ifdef CONFIG_OPROFILE_IBS - case IBS_FETCH_BEGIN: - add_ibs_begin(cpu, IBS_FETCH_CODE, mm); - break; - case IBS_OP_BEGIN: - add_ibs_begin(cpu, IBS_OP_CODE, mm); - break; -#endif - default: + add_kernel_ctx_switch(flags & IS_KERNEL); + } + if (flags & USER_CTX_SWITCH) { /* userspace context switch */ oldmm = mm; - new = (struct task_struct *)sample->event; + new = (struct task_struct *)sample->data[0]; release_mm(oldmm); mm = take_tasks_mm(new); if (mm != oldmm) cookie = get_exec_dcookie(mm); add_user_ctx_switch(new, cookie); - break; } +#ifdef CONFIG_OPROFILE_IBS + if (flags & IBS_FETCH_BEGIN) + add_ibs_begin(cpu, IBS_FETCH_CODE, mm); + if (flags & IBS_OP_BEGIN) + add_ibs_begin(cpu, IBS_OP_CODE, mm); +#endif continue; } diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c index 400f7fc..e859d23 100644 --- a/drivers/oprofile/cpu_buffer.c +++ b/drivers/oprofile/cpu_buffer.c @@ -212,6 +212,59 @@ unsigned long op_cpu_buffer_entries(int cpu) + ring_buffer_entries_cpu(op_ring_buffer_write, cpu); } +static int +op_add_code(struct oprofile_cpu_buffer *cpu_buf, unsigned long backtrace, + int is_kernel, struct task_struct *task) +{ + struct op_entry entry; + struct op_sample *sample; + unsigned long flags; + int size; + + flags = 0; + + if (backtrace) + flags |= TRACE_BEGIN; + + /* notice a switch from user->kernel or vice versa */ + is_kernel = !!is_kernel; + if (cpu_buf->last_is_kernel != is_kernel) { + cpu_buf->last_is_kernel = is_kernel; + flags |= KERNEL_CTX_SWITCH; + if (is_kernel) + flags |= IS_KERNEL; + } + + /* notice a task switch */ + if (cpu_buf->last_task != task) { + cpu_buf->last_task = task; + flags |= USER_CTX_SWITCH; + } + + if (!flags) + /* nothing to do */ + return 0; + + if (flags & USER_CTX_SWITCH) + size = 1; + else + size = 0; + + sample = op_cpu_buffer_write_reserve(&entry, size); + if (!sample) + return -ENOMEM; + + sample->eip = ESCAPE_CODE; + sample->event = flags; + + if (size) + sample->data[0] = (unsigned long)task; + + op_cpu_buffer_write_commit(&entry); + + return 0; +} + static inline int op_add_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc, unsigned long event) @@ -229,26 +282,18 @@ op_add_sample(struct oprofile_cpu_buffer *cpu_buf, return op_cpu_buffer_write_commit(&entry); } -static inline int -add_code(struct oprofile_cpu_buffer *buffer, unsigned long value) -{ - return op_add_sample(buffer, ESCAPE_CODE, value); -} - -/* This must be safe from any context. It's safe writing here - * because of the head/tail separation of the writer and reader - * of the CPU buffer. +/* + * This must be safe from any context. * * is_kernel is needed because on some architectures you cannot * tell if you are in kernel or user space simply by looking at * pc. We tag this in the buffer by generating kernel enter/exit * events whenever is_kernel changes */ -static int log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc, - int is_kernel, unsigned long event) +static int +log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc, + unsigned long backtrace, int is_kernel, unsigned long event) { - struct task_struct *task; - cpu_buf->sample_received++; if (pc == ESCAPE_CODE) { @@ -256,23 +301,8 @@ static int log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc, return 0; } - is_kernel = !!is_kernel; - - task = current; - - /* notice a switch from user->kernel or vice versa */ - if (cpu_buf->last_is_kernel != is_kernel) { - cpu_buf->last_is_kernel = is_kernel; - if (add_code(cpu_buf, is_kernel)) - goto fail; - } - - /* notice a task switch */ - if (cpu_buf->last_task != task) { - cpu_buf->last_task = task; - if (add_code(cpu_buf, (unsigned long)task)) - goto fail; - } + if (op_add_code(cpu_buf, backtrace, is_kernel, current)) + goto fail; if (op_add_sample(cpu_buf, pc, event)) goto fail; @@ -286,7 +316,6 @@ fail: static inline void oprofile_begin_trace(struct oprofile_cpu_buffer *cpu_buf) { - add_code(cpu_buf, CPU_TRACE_BEGIN); cpu_buf->tracing = 1; } @@ -300,21 +329,21 @@ __oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs, unsigned long event, int is_kernel) { struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer); - - if (!oprofile_backtrace_depth) { - log_sample(cpu_buf, pc, is_kernel, event); - return; - } - - oprofile_begin_trace(cpu_buf); + unsigned long backtrace = oprofile_backtrace_depth; /* * if log_sample() fail we can't backtrace since we lost the * source of this event */ - if (log_sample(cpu_buf, pc, is_kernel, event)) - oprofile_ops.backtrace(regs, oprofile_backtrace_depth); + if (!log_sample(cpu_buf, pc, backtrace, is_kernel, event)) + /* failed */ + return; + if (!backtrace) + return; + + oprofile_begin_trace(cpu_buf); + oprofile_ops.backtrace(regs, backtrace); oprofile_end_trace(cpu_buf); } @@ -339,29 +368,14 @@ void oprofile_add_ibs_sample(struct pt_regs * const regs, { int is_kernel = !user_mode(regs); struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer); - struct task_struct *task; int fail = 0; cpu_buf->sample_received++; - /* notice a switch from user->kernel or vice versa */ - if (cpu_buf->last_is_kernel != is_kernel) { - if (add_code(cpu_buf, is_kernel)) - goto fail; - cpu_buf->last_is_kernel = is_kernel; - } + /* backtraces disabled for ibs */ + fail = fail || op_add_code(cpu_buf, 0, is_kernel, current); - /* notice a task switch */ - if (!is_kernel) { - task = current; - if (cpu_buf->last_task != task) { - if (add_code(cpu_buf, (unsigned long)task)) - goto fail; - cpu_buf->last_task = task; - } - } - - fail = fail || add_code(cpu_buf, ibs_code); + fail = fail || op_add_sample(cpu_buf, ESCAPE_CODE, ibs_code); fail = fail || op_add_sample(cpu_buf, ibs_sample[0], ibs_sample[1]); fail = fail || op_add_sample(cpu_buf, ibs_sample[2], ibs_sample[3]); fail = fail || op_add_sample(cpu_buf, ibs_sample[4], ibs_sample[5]); @@ -372,11 +386,8 @@ void oprofile_add_ibs_sample(struct pt_regs * const regs, fail = fail || op_add_sample(cpu_buf, ibs_sample[10], ibs_sample[11]); } - if (!fail) - return; - -fail: - cpu_buf->sample_lost_overflow++; + if (fail) + cpu_buf->sample_lost_overflow++; } #endif @@ -384,7 +395,7 @@ fail: void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event) { struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer); - log_sample(cpu_buf, pc, is_kernel, event); + log_sample(cpu_buf, pc, 0, is_kernel, event); } void oprofile_add_trace(unsigned long pc) diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h index d7c0545..e634dcf 100644 --- a/drivers/oprofile/cpu_buffer.h +++ b/drivers/oprofile/cpu_buffer.h @@ -78,10 +78,12 @@ int op_cpu_buffer_write_commit(struct op_entry *entry); struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu); unsigned long op_cpu_buffer_entries(int cpu); -/* transient events for the CPU buffer -> event buffer */ -#define CPU_IS_KERNEL 1 -#define CPU_TRACE_BEGIN 2 -#define IBS_FETCH_BEGIN 3 -#define IBS_OP_BEGIN 4 +/* extra data flags */ +#define KERNEL_CTX_SWITCH (1UL << 0) +#define IS_KERNEL (1UL << 1) +#define TRACE_BEGIN (1UL << 2) +#define USER_CTX_SWITCH (1UL << 3) +#define IBS_FETCH_BEGIN (1UL << 4) +#define IBS_OP_BEGIN (1UL << 5) #endif /* OPROFILE_CPU_BUFFER_H */ |