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x86, bts: provide in-kernel branch-trace interface

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Impact: cleanup

Move the BTS bits from ptrace.c into ds.c.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Markus Metzger
2008-12-11 13:49:59 +01:00
committed by Ingo Molnar
parent b0884e25fe
commit c2724775ce
10 changed files with 909 additions and 969 deletions
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50
arch/x86/kernel/process_64.c
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@@ -237,11 +237,14 @@ void exit_thread(void)
put_cpu();
}
#ifdef CONFIG_X86_DS
/* Free any DS contexts that have not been properly released. */
if (unlikely(t->ds_ctx)) {
/* we clear debugctl to make sure DS is not used. */
update_debugctlmsr(0);
ds_free(t->ds_ctx);
/* Free any BTS tracers that have not been properly released. */
if (unlikely(current->bts)) {
ds_release_bts(current->bts);
current->bts = NULL;
kfree(current->bts_buffer);
current->bts_buffer = NULL;
current->bts_size = 0;
}
#endif /* CONFIG_X86_DS */
}
@@ -471,35 +474,14 @@ static inline void __switch_to_xtra(struct task_struct *prev_p,
struct tss_struct *tss)
{
struct thread_struct *prev, *next;
unsigned long debugctl;
prev = &prev_p->thread,
next = &next_p->thread;
debugctl = prev->debugctlmsr;
#ifdef CONFIG_X86_DS
{
unsigned long ds_prev = 0, ds_next = 0;
if (prev->ds_ctx)
ds_prev = (unsigned long)prev->ds_ctx->ds;
if (next->ds_ctx)
ds_next = (unsigned long)next->ds_ctx->ds;
if (ds_next != ds_prev) {
/*
* We clear debugctl to make sure DS
* is not in use when we change it:
*/
debugctl = 0;
update_debugctlmsr(0);
wrmsrl(MSR_IA32_DS_AREA, ds_next);
}
}
#endif /* CONFIG_X86_DS */
if (next->debugctlmsr != debugctl)
if (test_tsk_thread_flag(next_p, TIF_DS_AREA_MSR) ||
test_tsk_thread_flag(prev_p, TIF_DS_AREA_MSR))
ds_switch_to(prev_p, next_p);
else if (next->debugctlmsr != prev->debugctlmsr)
update_debugctlmsr(next->debugctlmsr);
if (test_tsk_thread_flag(next_p, TIF_DEBUG)) {
@@ -534,14 +516,6 @@ static inline void __switch_to_xtra(struct task_struct *prev_p,
*/
memset(tss->io_bitmap, 0xff, prev->io_bitmap_max);
}
#ifdef CONFIG_X86_PTRACE_BTS
if (test_tsk_thread_flag(prev_p, TIF_BTS_TRACE_TS))
ptrace_bts_take_timestamp(prev_p, BTS_TASK_DEPARTS);
if (test_tsk_thread_flag(next_p, TIF_BTS_TRACE_TS))
ptrace_bts_take_timestamp(next_p, BTS_TASK_ARRIVES);
#endif /* CONFIG_X86_PTRACE_BTS */
}
/*