61c4628b53
Split the FPU save area from the task struct. This allows easy migration of FPU context, and it's generally cleaner. It also allows the following two optimizations: 1) only allocate when the application actually uses FPU, so in the first lazy FPU trap. This could save memory for non-fpu using apps. Next patch does this lazy allocation. 2) allocate the right size for the actual cpu rather than 512 bytes always. Patches enabling xsave/xrstor support (coming shortly) will take advantage of this. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
36 lines
917 B
C
36 lines
917 B
C
#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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static struct kmem_cache *task_xstate_cachep;
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int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
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{
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*dst = *src;
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dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep, GFP_KERNEL);
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if (!dst->thread.xstate)
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return -ENOMEM;
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WARN_ON((unsigned long)dst->thread.xstate & 15);
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memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
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return 0;
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}
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void free_thread_info(struct thread_info *ti)
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{
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kmem_cache_free(task_xstate_cachep, ti->task->thread.xstate);
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ti->task->thread.xstate = NULL;
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free_pages((unsigned long)(ti), get_order(THREAD_SIZE));
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}
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void arch_task_cache_init(void)
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{
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task_xstate_cachep =
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kmem_cache_create("task_xstate", xstate_size,
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__alignof__(union thread_xstate),
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SLAB_PANIC, NULL);
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}
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