lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Merge branch 'linus' into tracing/hw-breakpoints

Browse Source 
Conflicts:
	arch/x86/kernel/process_64.c

Semantic conflict fixed in:
	arch/x86/kvm/x86.c

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2009-09-15 12:18:15 +02:00
parent d6a65dffb3 1824090496
commit dca2d6ac09
3318 changed files with 281605 additions and 124914 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
arch/x86/kernel/process_64.c
View File

@@ -57,9 +57,6 @@
asmlinkage extern void ret_from_fork(void);
DEFINE_PER_CPU(struct task_struct *, current_task) = &init_task;
EXPORT_PER_CPU_SYMBOL(current_task);
DEFINE_PER_CPU(unsigned long, old_rsp);
static DEFINE_PER_CPU(unsigned char, is_idle);
@@ -399,9 +396,17 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
int cpu = smp_processor_id();
struct tss_struct *tss = &per_cpu(init_tss, cpu);
unsigned fsindex, gsindex;
bool preload_fpu;
/*
* If the task has used fpu the last 5 timeslices, just do a full
* restore of the math state immediately to avoid the trap; the
* chances of needing FPU soon are obviously high now
*/
preload_fpu = tsk_used_math(next_p) && next_p->fpu_counter > 5;
/* we're going to use this soon, after a few expensive things */
if (next_p->fpu_counter > 5)
if (preload_fpu)
prefetch(next->xstate);
/*
@@ -432,6 +437,13 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
load_TLS(next, cpu);
/* Must be after DS reload */
unlazy_fpu(prev_p);
/* Make sure cpu is ready for new context */
if (preload_fpu)
clts();
/*
* Leave lazy mode, flushing any hypercalls made here.
* This must be done before restoring TLS segments so
@@ -472,9 +484,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
wrmsrl(MSR_KERNEL_GS_BASE, next->gs);
prev->gsindex = gsindex;
/* Must be after DS reload */
unlazy_fpu(prev_p);
/*
* Switch the PDA and FPU contexts.
*/
@@ -493,15 +502,12 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
task_thread_info(prev_p)->flags & _TIF_WORK_CTXSW_PREV))
__switch_to_xtra(prev_p, next_p, tss);
/* If the task has used fpu the last 5 timeslices, just do a full
* restore of the math state immediately to avoid the trap; the
* chances of needing FPU soon are obviously high now
*
* tsk_used_math() checks prevent calling math_state_restore(),
* which can sleep in the case of !tsk_used_math()
/*
* Preload the FPU context, now that we've determined that the
* task is likely to be using it.
*/
if (tsk_used_math(next_p) && next_p->fpu_counter > 5)
math_state_restore();
if (preload_fpu)
__math_state_restore();
/*
* There's a problem with moving the arch_install_thread_hw_breakpoint()
* call before current is updated. Suppose a kernel breakpoint is