The patch titled
sched: fix broken smt/mc optimizations with CFS
has been removed from the -mm tree. Its filename was
sched-fix-broken-smt-mc-optimizations-with-cfs.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: sched: fix broken smt/mc optimizations with CFS
From: "Siddha, Suresh B" <suresh.b.siddha@xxxxxxxxx>
On a four package system with HT - HT load balancing optimizations were
broken. For example, if two tasks end up running on two logical threads of
one of the packages, scheduler is not able to pull one of the tasks to a
completely idle package.
In this scenario, for nice-0 tasks, imbalance calculated by scheduler will be
512 and find_busiest_queue() will return 0 (as each cpu's load is 1024 >
imbalance and has only one task running).
Similarly MC scheduler optimizations also get fixed with this patch.
Signed-off-by: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/sched.c | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/sched.c~sched-fix-broken-smt-mc-optimizations-with-cfs kernel/sched.c
--- a/kernel/sched.c~sched-fix-broken-smt-mc-optimizations-with-cfs
+++ a/kernel/sched.c
@@ -2494,7 +2494,7 @@ group_next:
* a think about bumping its value to force at least one task to be
* moved
*/
- if (*imbalance + SCHED_LOAD_SCALE_FUZZ < busiest_load_per_task/2) {
+ if (*imbalance < busiest_load_per_task) {
unsigned long tmp, pwr_now, pwr_move;
unsigned int imbn;
_
Patches currently in -mm which might be from suresh.b.siddha@xxxxxxxxx are
origin.patch
intel-iommu-dmar-detection-and-parsing-logic.patch
intel-iommu-pci-generic-helper-function.patch
intel-iommu-clflush_cache_range-now-takes-size-param.patch
intel-iommu-iova-allocation-and-management-routines.patch
intel-iommu-intel-iommu-driver.patch
intel-iommu-avoid-memory-allocation-failures-in-dma-map-api-calls.patch
intel-iommu-intel-iommu-cmdline-option-forcedac.patch
intel-iommu-dmar-fault-handling-support.patch
intel-iommu-iommu-gfx-workaround.patch
intel-iommu-iommu-floppy-workaround.patch
intel-iommu-optimize-sg-map-unmap-calls.patch
-
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