]> git.karo-electronics.de Git - linux-beck.git/commit
s390/fpu: allocate 'struct fpu' with the task_struct
authorMartin Schwidefsky <schwidefsky@de.ibm.com>
Fri, 1 Apr 2016 13:42:15 +0000 (15:42 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Thu, 21 Apr 2016 07:51:15 +0000 (09:51 +0200)
commit3f6813b9a5e0aaec162a10037c203771a1b2c110
tree4c7ae317f66c97fe422485b7ec1981c804b0cb65
parentc7d4d259b7477866376435155eb0ccdaee880677
s390/fpu: allocate 'struct fpu' with the task_struct

Analog to git commit 0c8c0f03e3a292e031596484275c14cf39c0ab7a
"x86/fpu, sched: Dynamically allocate 'struct fpu'"
move the struct fpu to the end of the struct thread_struct,
set CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT and add the
setup_task_size() function to calculate the correct size
fo the task struct.

For the performance_defconfig this increases the size of
struct task_struct from 7424 bytes to 7936 bytes (MACHINE_HAS_VX==1)
or 7552 bytes (MACHINE_HAS_VX==0). The dynamic allocation of the
struct fpu is removed. The slab cache uses an 8KB block for the
task struct in all cases, there is enough room for the struct fpu.
For MACHINE_HAS_VX==1 each task now needs 512 bytes less memory.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
arch/s390/Kconfig
arch/s390/include/asm/fpu/types.h
arch/s390/include/asm/processor.h
arch/s390/kernel/process.c
arch/s390/kernel/setup.c