Commit c7aceaba authored by Richard Kennedy's avatar Richard Kennedy Committed by Ingo Molnar
Browse files

sched: reorder task_struct to reduce padding on 64bit builds 



This patch removes 24 bytes of padding and allows 1 extra object per
slab on my fedora based config.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 81d41d7e

include/linux/sched.h

+8 −8
Original line number Diff line number Diff line
@@ -1021,6 +1021,7 @@ struct task_struct { 
#endif



	int prio, static_prio, normal_prio;

	unsigned int rt_priority;

	const struct sched_class *sched_class;

	struct sched_entity se;

	struct sched_rt_entity rt;
@@ -1104,7 +1105,6 @@ struct task_struct { 
	int __user *set_child_tid;		/* CLONE_CHILD_SETTID */

	int __user *clear_child_tid;		/* CLONE_CHILD_CLEARTID */



	unsigned int rt_priority;

	cputime_t utime, stime, utimescaled, stimescaled;

	cputime_t gtime;

	cputime_t prev_utime, prev_stime;
@@ -1123,12 +1123,12 @@ struct task_struct { 
	gid_t gid,egid,sgid,fsgid;

	struct group_info *group_info;

	kernel_cap_t   cap_effective, cap_inheritable, cap_permitted, cap_bset;

	unsigned securebits;

	struct user_struct *user;

	unsigned securebits;

#ifdef CONFIG_KEYS

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

	struct key *request_key_auth;	/* assumed request_key authority */

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

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

#endif

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

				     - access with [gs]et_task_comm (which lock
@@ -1215,8 +1215,8 @@ struct task_struct { 
# define MAX_LOCK_DEPTH 48UL

	u64 curr_chain_key;

	int lockdep_depth;

	struct held_lock held_locks[MAX_LOCK_DEPTH];

	unsigned int lockdep_recursion;

	struct held_lock held_locks[MAX_LOCK_DEPTH];

#endif



/* journalling filesystem info */
@@ -1244,10 +1244,6 @@ struct task_struct { 
	u64 acct_vm_mem1;	/* accumulated virtual memory usage */

	cputime_t acct_stimexpd;/* stime since last update */

#endif

#ifdef CONFIG_NUMA

  	struct mempolicy *mempolicy;

	short il_next;

#endif

#ifdef CONFIG_CPUSETS

	nodemask_t mems_allowed;

	int cpuset_mems_generation;
@@ -1266,6 +1262,10 @@ struct task_struct { 
#endif

	struct list_head pi_state_list;

	struct futex_pi_state *pi_state_cache;

#endif

#ifdef CONFIG_NUMA

	struct mempolicy *mempolicy;

	short il_next;

#endif

	atomic_t fs_excl;	/* holding fs exclusive resources */

	struct rcu_head rcu;