brk increase/decrease of one page

Context switch via pipes

eventfd read/write of 8 bytes

futex(FUTEX_WAKE)

futex(FUTEX_WAIT)

futex(FUTEX_WAKE_PRIVATE)

futex(FUTEX_WAIT_PRIVATE)

getppid

Separate file write lock/unlock

Separate file lseek

Same file lseek

malloc/free of 128MB

malloc/free of 1kB

Anonymous memory mmap/munmap of 128MB

Separate file mmap/munmap of 128MB

Separate file open/close

Separate file open/close in different directories

Same file open/close

Anonymous memory page fault

Separate file private mapping page fault

Separate file shared mapping page fault

pipe read/write

poll of 1 fd

poll of 128 fds

POSIX semaphores

Separate file pread

Same file pread

Contended pthread mutex

Uncontended pthread mutex

Separate file pwrite