The patch titled
mm: Fix incorrect mempolicy for idle threads
has been removed from the -mm tree. Its filename is
mm-fix-incorrect-mempolicy-for-idle-threads.patch
This patch was dropped because it was nacked by the maintainer
------------------------------------------------------
Subject: mm: Fix incorrect mempolicy for idle threads
From: Ravikiran G Thirumalai <kiran@xxxxxxxxxxxx>
The kernel boots up on the BP with an initial memory policy of
MPOL_INTERLEAVE (start_kernel() -> numa_policy_init()). This is done to
avoid all boot data structure allocations to be off the boot node.
Current mainline resets the memory policy to MPOL_DEFAULT at init(), just
before calling userspace init. But, this is too late and leaves the kernel
idle thread with MPOL_INTERLEAVE, causing later allocations off
interrupt/BH context to use MPOL_INTERLEAVE, rather than MPOL_DEFAULT (if
the interrupt occurs on an idle cpu).
This can be fixed by changing the mempolicy to MPOL_DEFAULT just before the
'init' kernel thread is spawned, OR just before smp_init() (smp_init would
spawn idle threads). The following patch uses the latter approach and
moves numa_default_policy() to just before smp_init().
Signed-off-by: Alok N Kataria <alok.kataria@xxxxxxxxxxxxxx>
Signed-off-by: Ravikiran Thirumalai <kiran@xxxxxxxxxxxx>
Signed-off-by: Shai Fultheim <shai@xxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: Christoph Lameter <clameter@xxxxxxxxxxxx>
Cc: Paul Jackson <pj@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
init/main.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN init/main.c~mm-fix-incorrect-mempolicy-for-idle-threads init/main.c
--- a/init/main.c~mm-fix-incorrect-mempolicy-for-idle-threads
+++ a/init/main.c
@@ -727,6 +727,8 @@ static int init(void * unused)
do_pre_smp_initcalls();
+ numa_default_policy();
+
smp_init();
sched_init_smp();
@@ -762,7 +764,6 @@ static int init(void * unused)
unlock_kernel();
mark_rodata_ro();
system_state = SYSTEM_RUNNING;
- numa_default_policy();
if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
printk(KERN_WARNING "Warning: unable to open an initial console.\n");
_
Patches currently in -mm which might be from kiran@xxxxxxxxxxxx are
origin.patch
mm-fix-incorrect-mempolicy-for-idle-threads.patch
slab-leaks3-default-y.patch
-
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