diff options
| author | Richard Braun <rbraun@sceen.net> | 2013-07-01 21:09:40 +0200 |
|---|---|---|
| committer | Richard Braun <rbraun@sceen.net> | 2013-07-01 21:09:40 +0200 |
| commit | ca3910f342605ab91011e7d72e065b6758ce9df0 (patch) | |
| tree | d0abddf4f6ac1069f570b378c912fb5cd2abd517 /kern/thread.c | |
| parent | 75d1643bc6478538b0c8e13447fddd1f3b5b7f13 (diff) | |
x86/pmap: improve TLB invalidation
Add a processor bitmap per physical map to determine processors on which
a pmap is loaded, so that only those processors receive update IPIs. In
addition, implement lazy TLB invalidation by not loading page tables
when switching to a kernel thread. To finish with, the thread module now
calls pmap_load unconditionally without making assumptions about pmap
optimizations.
Diffstat (limited to 'kern/thread.c')
| -rw-r--r-- | kern/thread.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/kern/thread.c b/kern/thread.c index f19ec853..3ee8da93 100644 --- a/kern/thread.c +++ b/kern/thread.c @@ -473,8 +473,7 @@ thread_runq_schedule(struct thread_runq *runq, struct thread *prev) assert((next != runq->idler) || (runq->nr_threads == 0)); if (prev != next) { - if ((prev->task != next->task) && (next->task != kernel_task)) - pmap_load(next->task->map->pmap); + pmap_load(next->task->map->pmap); /* * That's where the true context switch occurs. The next thread must @@ -1893,9 +1892,7 @@ thread_run(void) spinlock_lock(&runq->lock); thread = thread_runq_get_next(thread_runq_local()); - if (thread->task != kernel_task) - pmap_load(thread->task->map->pmap); - + pmap_load(thread->task->map->pmap); tcb_load(&thread->tcb); } |