Messages in this thread | | | Date | Mon, 23 Aug 2004 16:35:12 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: page fault fastpath patch v2: fix race conditions, stats for 8,32 and 512 cpu SMP |
| |
On Mon, 23 Aug 2004, Rajesh Venkatasubramanian wrote:
> So there are no other active thread (mm_user) other than the current > exit_mmap() thread. This gives thread exclusion. So we don't need > mm->mmap_sem. > > However, we have to lock out truncate()->zap_pmd_range(), rmap.c > functions, and other places from walking the page tables while we > are freeing the page tables in exit_mmap(). The page_table_lock in > exit_mmap() provides that exclusion. > > That's my understanding. Correct me if I am wrong.
Correct. I just looked through the function and it unlinks the pgd before unlocking page_table_lock. It frees the pgd tree content later.
Since no mm_user is active anymore no pte ops occur and therefore also atomic pte operations do not need protection.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |