thp: cleanup khugepaged startup
Few trivial cleanups:
- no need to call set_recommended_min_free_kbytes() from
late_initcall() -- start_khugepaged() calls it;
- no need to call set_recommended_min_free_kbytes() from
start_khugepaged() if khugepaged is not started;
- there isn't much point in running start_khugepaged() if we've just
set transparent_hugepage_flags to zero;
- start_khugepaged() is misnamed -- it also used to stop the thread;
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 0af19ff..078832c 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -110,10 +110,6 @@
int nr_zones = 0;
unsigned long recommended_min;
- /* khugepaged thread has stopped to failed to start */
- if (!khugepaged_thread)
- return 0;
-
for_each_populated_zone(zone)
nr_zones++;
@@ -145,9 +141,8 @@
setup_per_zone_wmarks();
return 0;
}
-late_initcall(set_recommended_min_free_kbytes);
-static int start_khugepaged(void)
+static int start_stop_khugepaged(void)
{
int err = 0;
if (khugepaged_enabled()) {
@@ -158,6 +153,7 @@
pr_err("khugepaged: kthread_run(khugepaged) failed\n");
err = PTR_ERR(khugepaged_thread);
khugepaged_thread = NULL;
+ goto fail;
}
if (!list_empty(&khugepaged_scan.mm_head))
@@ -168,7 +164,7 @@
kthread_stop(khugepaged_thread);
khugepaged_thread = NULL;
}
-
+fail:
return err;
}
@@ -302,7 +298,7 @@
int err;
mutex_lock(&khugepaged_mutex);
- err = start_khugepaged();
+ err = start_stop_khugepaged();
mutex_unlock(&khugepaged_mutex);
if (err)
@@ -651,10 +647,12 @@
* where the extra memory used could hurt more than TLB overhead
* is likely to save. The admin can still enable it through /sys.
*/
- if (totalram_pages < (512 << (20 - PAGE_SHIFT)))
+ if (totalram_pages < (512 << (20 - PAGE_SHIFT))) {
transparent_hugepage_flags = 0;
+ return 0;
+ }
- err = start_khugepaged();
+ err = start_stop_khugepaged();
if (err)
goto err_khugepaged;