David Mosberger asked that this be backed out:
"I do not believe that flushing the TLB before migration is be the right thing
to do on ia64 machines which support global TLB purges (i.e., all but SGI's
machines)."
It was of huge benefit for the SGI machines, so work is ongoing.
---
25-akpm/include/asm-generic/tlb.h | 2 --
25-akpm/include/asm-ia64/tlb.h | 2 --
25-akpm/kernel/sched.c | 10 ----------
3 files changed, 14 deletions(-)
diff -puN include/asm-generic/tlb.h~revert-process-migration-speedup include/asm-generic/tlb.h
--- 25/include/asm-generic/tlb.h~revert-process-migration-speedup Wed May 12 15:04:55 2004
+++ 25-akpm/include/asm-generic/tlb.h Wed May 12 15:05:24 2004
@@ -146,6 +146,4 @@ static inline void tlb_remove_page(struc
__pmd_free_tlb(tlb, pmdp); \
} while (0)
-#define tlb_migrate_prepare(mm) do { } while(0)
-
#endif /* _ASM_GENERIC__TLB_H */
diff -puN include/asm-ia64/tlb.h~revert-process-migration-speedup include/asm-ia64/tlb.h
--- 25/include/asm-ia64/tlb.h~revert-process-migration-speedup Wed May 12 15:04:55 2004
+++ 25-akpm/include/asm-ia64/tlb.h Wed May 12 15:05:24 2004
@@ -211,8 +211,6 @@ __tlb_remove_tlb_entry (struct mmu_gathe
tlb->end_addr = address + PAGE_SIZE;
}
-#define tlb_migrate_prepare(mm) flush_tlb_mm(mm)
-
#define tlb_start_vma(tlb, vma) do { } while (0)
#define tlb_end_vma(tlb, vma) do { } while (0)
diff -puN kernel/sched.c~revert-process-migration-speedup kernel/sched.c
--- 25/kernel/sched.c~revert-process-migration-speedup Wed May 12 15:04:55 2004
+++ 25-akpm/kernel/sched.c Wed May 12 15:05:24 2004
@@ -26,8 +26,6 @@
#include <linux/highmem.h>
#include <linux/smp_lock.h>
#include <asm/mmu_context.h>
-#include <linux//pagemap.h>
-#include <asm/tlb.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/kernel_stat.h>
@@ -1302,14 +1300,6 @@ static void sched_migrate_task(task_t *p
wake_up_process(mt);
put_task_struct(mt);
wait_for_completion(&req.done);
-
- /*
- * we want a new context here. This eliminates TLB
- * flushes on the cpus where the process executed prior to
- * the migration.
- */
- tlb_migrate_prepare(current->mm);
-
return;
}
out:
_