[Devel] Re: Playing with namespaces and bloat-o-meeter

[Cedric Le Goater]

Cedric Le Goater wrote:
> Serge E. Hallyn wrote:
>> Quoting Pavel Emelyanov (xemul at openvz.org):
>>> Hi, guys!
>>>
>>> I've noticed that compiling out all the core related to
>>> cloning and cleaning the new namespace saves us more than
>>> a Kbyte (!) from the vmlinux.
>>>
>>> add/remove: 19/0 grow/shrink: 6/6 up/down: 1532/-336 (1196)
>>> function                                     old     new   delta
>>> copy_user_ns                                   -     181    +181
>>> copy_ipcs                                      -     149    +149
>>> copy_utsname                                   -     120    +120
>>> shm_exit_ns                                    -     106    +106
>>> sem_exit_ns                                    -     106    +106
>>> msg_exit_ns                                    -     106    +106
>>> freeary                                        -     100    +100
>>> release_uids                                   -      95     +95
>>> freeque                                        -      92     +92
>>> free_nsproxy                                  48      99     +51
>>> __sem_init_ns                                  -      45     +45
>>> shm_init_ns                                    -      42     +42
>>> sem_init_ns                                    -      42     +42
>>> msg_init_ns                                    -      42     +42
>>> __shm_init_ns                                  -      38     +38
>>> create_new_namespaces                        300     335     +35
>>> __msg_init_ns                                  -      31     +31
>>> sysvipc_proc_release                           5      35     +30
>>> free_ipc_ns                                    -      30     +30
>>> do_shm_rmid                                    -      29     +29
>>> shm_release                                   18      39     +21
>>> free_user_ns                                   -      16     +16
>>> sysvipc_proc_open                            100     111     +11
>>> do_shmat                                     778     787      +9
>>> free_uts_ns                                    -       5      +5
>>> sys_shmctl                                  1934    1907     -27
>>> msg_init                                      82      47     -35
>>> shm_init                                      92      47     -45
>>> sem_init                                      99      44     -55
>>> sys_msgctl                                  1394    1311     -83
>>> sys_semctl                                  2123    2032     -91
>>>
>>> Since there already were some questions like "do I need it
>>> on my cellphone?" in reply to pid namespaces patches and 
>>> so on, why don't we make ALL the namespaces cloning code 
>>> under the config option to make those people happy?
>>>
>>> Here's the proposed patch.
>> How about a single config variable for all namespaces?
> 
> yes good idea.


oops, that done already in the patch : CONFIG_NAMESPACES

thanks :)

C.

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