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commit e428694a8f6857a10afbd99660bc695c353aa74b
Author: Matt Helsley <matthltc@xxxxxxxxxx>
Date: Mon Jul 13 05:36:15 2009 -0700
Save and restore the [compat_]robust_list member of the task struct.
These lists record which futexes the task holds. To keep the overhead of
robust futexes low the list is kept in userspace. When the task exits the
kernel carefully walks these lists to recover held futexes that
other tasks may be attempting to acquire with FUTEX_WAIT.
Because they point to userspace memory that is saved/restored by
checkpoint/restart saving the list pointers themselves is safe.
While saving the pointers is safe during checkpoint, restart is tricky
because the robust futex ABI contains provisions for changes based on
checking the size of the list head. So we need to save the length of
the list head too in order to make sure that the kernel used during
restart is capable of handling that ABI. Since there is only one ABI
supported at the moment taking the list head's size is simple. Should
the ABI change we will need to use the same size as specified during
sys_set_robust_list() and hence some new means of determining the length
of this userspace structure in sys_checkpoint would be required.
Rather than rewrite the logic that checks and handles the ABI we reuse
sys_set_robust_list() by factoring out the body of the function and
calling it during restart.
Signed-off-by: Matt Helsley <matthltc@xxxxxxxxxx>
commit 135961c0bbe19ba9bf21c40d0b837630df2d2639
Author: Oren Laadan <orenl@xxxxxxxxxxxxxxx>
Date: Mon Jul 13 18:56:50 2009 -0400
c/r: export include/linux/checkpoint.h
Signed-off-by: Oren Laadan <orenl@xxxxxxxxxxxxxxx>
-----------------------------------------------------------------------
Summary of changes:
checkpoint/process.c | 2 +
include/linux/Kbuild | 1 +
include/linux/checkpoint_hdr.h | 5 ++++
include/linux/compat.h | 3 +-
include/linux/futex.h | 46 ++++++++++++++++++++++++++++++++++++++++
kernel/futex.c | 19 ++++++++++------
kernel/futex_compat.c | 13 ++++++++--
7 files changed, 78 insertions(+), 11 deletions(-)
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