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oprofile: use new data sample format for ibs

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The new ring buffer implementation allows the storage of samples with
different size. This patch implements the usage of the new sample
format to store ibs samples in the cpu buffer. Until now, writing to
the cpu buffer could lead to incomplete sampling sequences since IBS
samples were transfered in multiple samples. Due to a full buffer,
data could be lost at any time. This can't happen any more since the
complete data is reserved in advance and then stored in a single
sample.

Signed-off-by: Robert Richter <robert.richter@amd.com>
This commit is contained in:
Robert Richter 2009-01-05 10:35:31 +01:00
parent bd7dc46f77
commit 1acda878e2
4 changed files with 76 additions and 137 deletions
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39
drivers/oprofile/cpu_buffer.c
View file

@ -363,31 +363,38 @@ void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)
#ifdef CONFIG_OPROFILE_IBS
void oprofile_add_ibs_sample(struct pt_regs * const regs,
unsigned int * const ibs_sample, int ibs_code)
/*
* Add samples with data to the ring buffer.
*
* Use op_cpu_buffer_add_data(&entry, val) to add data and
* op_cpu_buffer_write_commit(&entry) to commit the sample.
*/
void oprofile_add_data(struct op_entry *entry, struct pt_regs * const regs,
unsigned long pc, int code, int size)
{
struct op_sample *sample;
int is_kernel = !user_mode(regs);
struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
int fail = 0;
cpu_buf->sample_received++;
/* backtraces disabled for ibs */
fail = fail || op_add_code(cpu_buf, 0, is_kernel, current);
/* no backtraces for samples with data */
if (op_add_code(cpu_buf, 0, is_kernel, current))
goto fail;
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]);
sample = op_cpu_buffer_write_reserve(entry, size + 2);
if (!sample)
goto fail;
sample->eip = ESCAPE_CODE;
sample->event = 0; /* no flags */
if (ibs_code == IBS_OP_BEGIN) {
fail = fail || op_add_sample(cpu_buf, ibs_sample[6], ibs_sample[7]);
fail = fail || op_add_sample(cpu_buf, ibs_sample[8], ibs_sample[9]);
fail = fail || op_add_sample(cpu_buf, ibs_sample[10], ibs_sample[11]);
}
op_cpu_buffer_add_data(entry, code);
op_cpu_buffer_add_data(entry, pc);
if (fail)
cpu_buf->sample_lost_overflow++;
return;
fail:
cpu_buf->sample_lost_overflow++;
}
#endif