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Commit 18796aa0 authored by Alexey Dobriyan's avatar Alexey Dobriyan Committed by Linus Torvalds
Browse files

task_struct: move ->fpu_counter and ->oomkilladj 



There is nice 2 byte hole after struct task_struct::ioprio field
into which we can put two 1-byte fields: ->fpu_counter and ->oomkilladj.

Signed-off-by: default avatarAlexey Dobriyan <adobriyan@sw.ru>
Acked-by: default avatarArjan van de Ven <arjan@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f7a75f0a

include/linux/sched.h

+10 −10
Original line number Original line Diff line number Diff line
@@ -918,6 +918,16 @@ struct task_struct { 
#endif

#endif





	unsigned short ioprio;

	unsigned short ioprio;

	/*

	 * fpu_counter contains the number of consecutive context switches

	 * that the FPU is used. If this is over a threshold, the lazy fpu

	 * saving becomes unlazy to save the trap. This is an unsigned char

	 * so that after 256 times the counter wraps and the behavior turns

	 * lazy again; this to deal with bursty apps that only use FPU for

	 * a short time

	 */

	unsigned char fpu_counter;

	s8 oomkilladj; /* OOM kill score adjustment (bit shift). */

#ifdef CONFIG_BLK_DEV_IO_TRACE

#ifdef CONFIG_BLK_DEV_IO_TRACE

	unsigned int btrace_seq;

	unsigned int btrace_seq;

#endif

#endif
@@ -1003,16 +1013,6 @@ struct task_struct { 
	struct key *thread_keyring;	/* keyring private to this thread */

	struct key *thread_keyring;	/* keyring private to this thread */

	unsigned char jit_keyring;	/* default keyring to attach requested keys to */

	unsigned char jit_keyring;	/* default keyring to attach requested keys to */

#endif

#endif

	/*

	 * fpu_counter contains the number of consecutive context switches

	 * that the FPU is used. If this is over a threshold, the lazy fpu

	 * saving becomes unlazy to save the trap. This is an unsigned char

	 * so that after 256 times the counter wraps and the behavior turns

	 * lazy again; this to deal with bursty apps that only use FPU for

	 * a short time

	 */

	unsigned char fpu_counter;

	s8 oomkilladj; /* OOM kill score adjustment (bit shift). */

	char comm[TASK_COMM_LEN]; /* executable name excluding path

	char comm[TASK_COMM_LEN]; /* executable name excluding path

				     - access with [gs]et_task_comm (which lock

				     - access with [gs]et_task_comm (which lock

				       it with task_lock())

				       it with task_lock())