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

Same file pwrite

Separate file read

Same file read

Separate file O_DIRECT read

Same file O_DIRECT read

Separate file seek+read

sched_yield