Messages in this thread | | | Date | Tue, 7 Aug 2007 21:03:54 -0500 | From | Matt Mackall <> | Subject | Re: [RFC][PATCH 4/5] introduce TASK_SIZE_OF() for all arches |
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On Tue, Aug 07, 2007 at 03:33:03PM -0700, Dave Hansen wrote: > > For the /proc/<pid>/pagemap code[1], we need to able to query how > much virtual address space a particular task has. The trick is > that we do it through /proc and can't use TASK_SIZE since it > references "current" on some arches. The process opening the > /proc file might be a 32-bit process opening a 64-bit process's > pagemap file.
That seems perfectly sensible to me, but I think you'll need to bounce it off Andrew at least. (cc:ed)
> x86_64 already has a TASK_SIZE_OF() macro: > > #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64) > > I'd like to have that for other architectures. So, add it > for all the architectures that actually use "current" in > their TASK_SIZE. For the others, just add a quick #define > in sched.h to use plain old TASK_SIZE. > > 1. http://www.linuxworld.com/news/2007/042407-kernel.html > > Signed-off-by: Dave Hansen <haveblue@us.ibm.com> > --- > > lxc-dave/include/asm-ia64/processor.h | 3 ++- > lxc-dave/include/asm-parisc/processor.h | 3 ++- > lxc-dave/include/asm-powerpc/processor.h | 4 +++- > lxc-dave/include/asm-s390/processor.h | 2 ++ > lxc-dave/include/linux/sched.h | 4 ++++ > 5 files changed, 13 insertions(+), 3 deletions(-) > > diff -puN include/asm-ia64/processor.h~task_size_of include/asm-ia64/processor.h > --- lxc/include/asm-ia64/processor.h~task_size_of 2007-08-07 15:30:54.000000000 -0700 > +++ lxc-dave/include/asm-ia64/processor.h 2007-08-07 15:30:54.000000000 -0700 > @@ -31,7 +31,8 @@ > * each (assuming 8KB page size), for a total of 8TB of user virtual > * address space. > */ > -#define TASK_SIZE (current->thread.task_size) > +#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size) > +#define TASK_SIZE TASK_SIZE_OF(current) > > /* > * This decides where the kernel will search for a free chunk of vm > diff -puN include/asm-parisc/processor.h~task_size_of include/asm-parisc/processor.h > --- lxc/include/asm-parisc/processor.h~task_size_of 2007-08-07 15:30:54.000000000 -0700 > +++ lxc-dave/include/asm-parisc/processor.h 2007-08-07 15:30:54.000000000 -0700 > @@ -32,7 +32,8 @@ > #endif > #define current_text_addr() ({ void *pc; current_ia(pc); pc; }) > > -#define TASK_SIZE (current->thread.task_size) > +#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size) > +#define TASK_SIZE (current->thread.task_size) > #define TASK_UNMAPPED_BASE (current->thread.map_base) > > #define DEFAULT_TASK_SIZE32 (0xFFF00000UL) > diff -puN include/asm-powerpc/processor.h~task_size_of include/asm-powerpc/processor.h > --- lxc/include/asm-powerpc/processor.h~task_size_of 2007-08-07 15:30:54.000000000 -0700 > +++ lxc-dave/include/asm-powerpc/processor.h 2007-08-07 15:30:54.000000000 -0700 > @@ -107,7 +107,9 @@ extern struct task_struct *last_task_use > */ > #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE)) > > -#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ > +#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ > + TASK_SIZE_USER32 : TASK_SIZE_USER64) > +#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ > TASK_SIZE_USER32 : TASK_SIZE_USER64) > > /* This decides where the kernel will search for a free chunk of vm > diff -puN include/asm-s390/processor.h~task_size_of include/asm-s390/processor.h > --- lxc/include/asm-s390/processor.h~task_size_of 2007-08-07 15:30:54.000000000 -0700 > +++ lxc-dave/include/asm-s390/processor.h 2007-08-07 15:30:54.000000000 -0700 > @@ -75,6 +75,8 @@ extern struct task_struct *last_task_use > > # define TASK_SIZE (test_thread_flag(TIF_31BIT) ? \ > (0x80000000UL) : (0x40000000000UL)) > +# define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_31BIT) ? \ > + (0x80000000UL) : (0x40000000000UL)) > # define TASK_UNMAPPED_BASE (TASK_SIZE / 2) > # define DEFAULT_TASK_SIZE (0x40000000000UL) > > diff -puN include/linux/sched.h~task_size_of include/linux/sched.h > --- lxc/include/linux/sched.h~task_size_of 2007-08-07 15:30:54.000000000 -0700 > +++ lxc-dave/include/linux/sched.h 2007-08-07 15:30:54.000000000 -0700 > @@ -1712,6 +1712,10 @@ static inline void inc_syscw(struct task > } > #endif > > +#ifndef TASK_SIZE_OF > +#define TASK_SIZE_OF(tsk) TASK_SIZE > +#endif > + > #endif /* __KERNEL__ */ > > #endif > _
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