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当我使用 mmap_lock 跟踪点时，发生了一些奇怪的事情。我发现内核中的 rwsem 由读者持有，而它由作家持有。那可能吗？

跟踪点输出如下所示： 跟踪点输出

           a.out-3240    (   3230) [002] ....  2202.590031: mmap_lock_start_locking: mm=000000001570189f  write=true ip=__vm_munmap+0xef/0x120
           a.out-3240    (   3230) [002] ....  2202.590032: mmap_lock_acquire_returned: mm=000000001570189f  write=true ip=__vm_munmap+0xdd/0x120 success=true
           a.out-3240    (   3230) [002] ....  2202.590033: mmap_lock_acquire_returned: mm=000000001570189f  write=false ip=__do_munmap+0x4a6/0x510 success=true
           a.out-3232    (   3230) [001] ....  2202.590041: mmap_lock_start_locking: mm=000000001570189f  write=false ip=do_user_addr_fault+0x26d/0x4d0
           a.out-3232    (   3230) [001] ....  2202.590041: mmap_lock_acquire_returned: mm=000000001570189f  write=false ip=do_user_addr_fault+0x25a/0x4d0 success=false
           a.out-3232    (   3230) [001] ....  2202.590042: mmap_lock_start_locking: mm=000000001570189f  write=false ip=do_user_addr_fault+0x3e4/0x4d0
           a.out-3237    (   3230) [000] ....  2202.590042: mmap_lock_start_locking: mm=000000001570189f  write=false ip=do_user_addr_fault+0x26d/0x4d0
           a.out-3232    (   3230) [001] ....  2202.590042: mmap_lock_acquire_returned: mm=000000001570189f  write=false ip=do_user_addr_fault+0x4bd/0x4d0 success=true
           a.out-3237    (   3230) [000] ....  2202.590042: mmap_lock_acquire_returned: mm=000000001570189f  write=false ip=do_user_addr_fault+0x25a/0x4d0 success=false
           a.out-3237    (   3230) [000] ....  2202.590043: mmap_lock_start_locking: mm=000000001570189f  write=false ip=do_user_addr_fault+0x3e4/0x4d0
           a.out-3237    (   3230) [000] ....  2202.590043: mmap_lock_acquire_returned: mm=000000001570189f  write=false ip=do_user_addr_fault+0x4bd/0x4d0 success=true
           a.out-3232    (   3230) [001] ....  2202.590045: mmap_lock_released: mm=000000001570189f  write=false ip=fault_dirty_shared_page+0xe7/0xf0
           a.out-3232    (   3230) [001] ....  2202.590045: mmap_lock_start_locking: mm=000000001570189f  write=false ip=do_user_addr_fault+0x3e4/0x4d0
           a.out-3232    (   3230) [001] ....  2202.590046: mmap_lock_acquire_returned: mm=000000001570189f  write=false ip=do_user_addr_fault+0x4bd/0x4d0 success=true
           a.out-3232    (   3230) [001] ....  2202.590046: mmap_lock_released: mm=000000001570189f  write=false ip=do_user_addr_fault+0x2e9/0x4d0
            node-643     (    643) [005] ....  2202.590052: mmap_lock_start_locking: mm=00000000cfc52fe9  write=false ip=do_user_addr_fault+0x26d/0x4d0
            node-643     (    643) [005] ....  2202.590052: mmap_lock_acquire_returned: mm=00000000cfc52fe9  write=false ip=do_user_addr_fault+0x25a/0x4d0 success=true
            node-643     (    643) [005] ....  2202.590061: mmap_lock_released: mm=00000000cfc52fe9  write=false ip=do_user_addr_fault+0x2e9/0x4d0
            node-728     (    728) [003] ....  2202.590074: mmap_lock_start_locking: mm=000000000bb644df  write=false ip=do_user_addr_fault+0x26d/0x4d0
            node-728     (    728) [003] ....  2202.590074: mmap_lock_acquire_returned: mm=000000000bb644df  write=false ip=do_user_addr_fault+0x25a/0x4d0 success=true
            node-728     (    728) [003] ....  2202.590076: mmap_lock_released: mm=000000000bb644df  write=false ip=do_user_addr_fault+0x2e9/0x4d0
           a.out-3240    (   3230) [002] ....  2202.590077: mmap_lock_released: mm=000000001570189f  write=false ip=__vm_munmap+0x10f/0x120
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