diff options
Diffstat (limited to 'debian/patches-rt/0302-mm-Disable-NUMA_BALANCING_DEFAULT_ENABLED-and-TRANSP.patch')
| -rw-r--r-- | debian/patches-rt/0302-mm-Disable-NUMA_BALANCING_DEFAULT_ENABLED-and-TRANSP.patch | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/debian/patches-rt/0302-mm-Disable-NUMA_BALANCING_DEFAULT_ENABLED-and-TRANSP.patch b/debian/patches-rt/0302-mm-Disable-NUMA_BALANCING_DEFAULT_ENABLED-and-TRANSP.patch new file mode 100644 index 000000000..e9b579280 --- /dev/null +++ b/debian/patches-rt/0302-mm-Disable-NUMA_BALANCING_DEFAULT_ENABLED-and-TRANSP.patch @@ -0,0 +1,51 @@ +From 4e8d89996a692bd5d4a094e55c0a88044993057f Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Fri, 29 Oct 2021 10:07:11 +0200 +Subject: [PATCH 302/323] mm: Disable NUMA_BALANCING_DEFAULT_ENABLED and + TRANSPARENT_HUGEPAGE on PREEMPT_RT +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz + +TRANSPARENT_HUGEPAGE: +There are potential non-deterministic delays to an RT thread if a critical +memory region is not THP-aligned and a non-RT buffer is located in the same +hugepage-aligned region. It's also possible for an unrelated thread to migrate +pages belonging to an RT task incurring unexpected page faults due to memory +defragmentation even if khugepaged is disabled. + +Regular HUGEPAGEs are not affected by this can be used. + +NUMA_BALANCING: +There is a non-deterministic delay to mark PTEs PROT_NONE to gather NUMA fault +samples, increased page faults of regions even if mlocked and non-deterministic +delays when migrating pages. + +[Mel Gorman worded 99% of the commit description]. + +Link: https://lore.kernel.org/all/20200304091159.GN3818@techsingularity.net/ +Link: https://lore.kernel.org/all/20211026165100.ahz5bkx44lrrw5pt@linutronix.de/ +Cc: stable-rt@vger.kernel.org +Cc: Mel Gorman <mgorman@techsingularity.net> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Acked-by: Mel Gorman <mgorman@techsingularity.net> +Link: https://lore.kernel.org/r/20211028143327.hfbxjze7palrpfgp@linutronix.de +Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> +--- + init/Kconfig | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/init/Kconfig b/init/Kconfig +index c5f276d782de..a62d2961064b 100644 +--- a/init/Kconfig ++++ b/init/Kconfig +@@ -878,7 +878,7 @@ config NUMA_BALANCING + bool "Memory placement aware NUMA scheduler" + depends on ARCH_SUPPORTS_NUMA_BALANCING + depends on !ARCH_WANT_NUMA_VARIABLE_LOCALITY +- depends on SMP && NUMA && MIGRATION ++ depends on SMP && NUMA && MIGRATION && !PREEMPT_RT + help + This option adds support for automatic NUMA aware memory/task placement. + The mechanism is quite primitive and is based on migrating memory when +-- +2.43.0 + |