[PATCH] powerpc/pseries: Don't attempt to acquire drc during memory hot add for assigned lmbs
From: John Allen <hidden>
Date: 2017-08-23 17:18:52
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
Check if an LMB is assigned before attempting to call dlpar_acquire_drc in order to avoid any unnecessary rtas calls. This substantially reduces the running time of memory hot add on lpars with large amounts of memory. Signed-off-by: John Allen <redacted> ---
diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
index ca9b2f4..95cf2ff 100644
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c@@ -817,6 +817,9 @@ static int dlpar_memory_add_by_count(u32 lmbs_to_add, struct property *prop) return -EINVAL; for (i = 0; i < num_lmbs && lmbs_to_add != lmbs_added; i++) { + if (lmbs[i].flags & DRCONF_MEM_ASSIGNED) + continue; + rc = dlpar_acquire_drc(lmbs[i].drc_index); if (rc) continue;