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authorIulia Manda <iulia.manda21@gmail.com>2014-10-31 01:13:31 +0100
committerIngo Molnar <mingo@kernel.org>2014-11-04 07:17:57 +0100
commit44dba3d5d6a10685fb15bd1954e62016334825e0 (patch)
tree6a0c9b0c34225a78263212037c69c87e97905211 /kernel/sched/sched.h
parentsched/deadline: Don't check CONFIG_SMP in switched_from_dl() (diff)
downloadlinux-44dba3d5d6a10685fb15bd1954e62016334825e0.tar.xz
linux-44dba3d5d6a10685fb15bd1954e62016334825e0.zip
sched: Refactor task_struct to use numa_faults instead of numa_* pointers
This patch simplifies task_struct by removing the four numa_* pointers in the same array and replacing them with the array pointer. By doing this, on x86_64, the size of task_struct is reduced by 3 ulong pointers (24 bytes on x86_64). A new parameter is added to the task_faults_idx function so that it can return an index to the correct offset, corresponding with the old precalculated pointers. All of the code in sched/ that depended on task_faults_idx and numa_* was changed in order to match the new logic. Signed-off-by: Iulia Manda <iulia.manda21@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: mgorman@suse.de Cc: dave@stgolabs.net Cc: riel@redhat.com Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/20141031001331.GA30662@winterfell Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/sched.h')
-rw-r--r--kernel/sched/sched.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 7e5c1eebc110..31f1e4d2996a 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -709,6 +709,13 @@ extern bool find_numa_distance(int distance);
#endif
#ifdef CONFIG_NUMA_BALANCING
+/* The regions in numa_faults array from task_struct */
+enum numa_faults_stats {
+ NUMA_MEM = 0,
+ NUMA_CPU,
+ NUMA_MEMBUF,
+ NUMA_CPUBUF
+};
extern void sched_setnuma(struct task_struct *p, int node);
extern int migrate_task_to(struct task_struct *p, int cpu);
extern int migrate_swap(struct task_struct *, struct task_struct *);