Commit 33adabdd authored by Li Hua's avatar Li Hua Committed by Zheng Zengkai
Browse files

arm: Optimize ttwu IPI 

hulk inclusion
category: feature
bugzilla: 176961 https://gitee.com/openeuler/kernel/issues/I4E05T



-------------------

When it is to wake up a task in a remote cpu shared LLC , we can
simply set need_resched flag, waking up a cpu that is in polling
idle. This wakeup action does not require an IPI.

But the premise is that it need to support _TIF_POLLING_NRFLAG

Signed-off-by: default avatarLi Hua <hucool.lihua@huawei.com>
Reviewed-by: default avatarChen Hui <judy.chenhui@huawei.com>
Signed-off-by: default avatarChen Jun <chenjun102@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent ff502cbf

arch/arm/include/asm/thread_info.h

+2 −0
Original line number Diff line number Diff line
@@ -145,6 +145,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp *, 
#define TIF_SECCOMP		7	/* seccomp syscall filtering active */

#define TIF_PATCH_PENDING	8	/* pending live patching update */



#define TIF_POLLING_NRFLAG     16      /* idle is polling for TIF_NEED_RESCHED */

#define TIF_USING_IWMMXT	17

#define TIF_MEMDIE		18	/* is terminating due to OOM killer */

#define TIF_RESTORE_SIGMASK	20
@@ -157,6 +158,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp *, 
#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)

#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)

#define _TIF_SECCOMP		(1 << TIF_SECCOMP)

#define _TIF_POLLING_NRFLAG    (1 << TIF_POLLING_NRFLAG)

#define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)

#define _TIF_PATCH_PENDING	(1 << TIF_PATCH_PENDING)