diff options
Diffstat (limited to 'meta/recipes-kernel/lttng/lttng-modules/0003-Fix-mm_compaction_migratepages-changed-in-linux-6.9-.patch')
| -rw-r--r-- | meta/recipes-kernel/lttng/lttng-modules/0003-Fix-mm_compaction_migratepages-changed-in-linux-6.9-.patch | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/meta/recipes-kernel/lttng/lttng-modules/0003-Fix-mm_compaction_migratepages-changed-in-linux-6.9-.patch b/meta/recipes-kernel/lttng/lttng-modules/0003-Fix-mm_compaction_migratepages-changed-in-linux-6.9-.patch new file mode 100644 index 0000000000..66c48ebe8f --- /dev/null +++ b/meta/recipes-kernel/lttng/lttng-modules/0003-Fix-mm_compaction_migratepages-changed-in-linux-6.9-.patch @@ -0,0 +1,81 @@ +From f4a6415f8d5fa447868d1fdc7119e0a328966379 Mon Sep 17 00:00:00 2001 +From: Kienan Stewart <kstewart@efficios.com> +Date: Mon, 25 Mar 2024 10:30:32 -0400 +Subject: [PATCH 3/4] Fix: mm_compaction_migratepages changed in linux 6.9-rc1 + +See upstream commit: + + commit ab755bf4249b992fc2140d615ab0a686d50765b4 + Author: Baolin Wang <baolin.wang@linux.alibaba.com> + Date: Tue Feb 20 14:16:31 2024 +0800 + + mm: compaction: update the cc->nr_migratepages when allocating or freeing the freepages + + Currently we will use 'cc->nr_freepages >= cc->nr_migratepages' comparison + to ensure that enough freepages are isolated in isolate_freepages(), + however it just decreases the cc->nr_freepages without updating + cc->nr_migratepages in compaction_alloc(), which will waste more CPU + cycles and cause too many freepages to be isolated. + + So we should also update the cc->nr_migratepages when allocating or + freeing the freepages to avoid isolating excess freepages. And I can see + fewer free pages are scanned and isolated when running thpcompact on my + Arm64 server: + + k6.7 k6.7_patched + Ops Compaction pages isolated 120692036.00 118160797.00 + Ops Compaction migrate scanned 131210329.00 154093268.00 + Ops Compaction free scanned 1090587971.00 1080632536.00 + Ops Compact scan efficiency 12.03 14.26 + + Moreover, I did not see an obvious latency improvements, this is likely + because isolating freepages is not the bottleneck in the thpcompact test + case. + + k6.7 k6.7_patched + Amean fault-both-1 1089.76 ( 0.00%) 1080.16 * 0.88%* + Amean fault-both-3 1616.48 ( 0.00%) 1636.65 * -1.25%* + Amean fault-both-5 2266.66 ( 0.00%) 2219.20 * 2.09%* + Amean fault-both-7 2909.84 ( 0.00%) 2801.90 * 3.71%* + Amean fault-both-12 4861.26 ( 0.00%) 4733.25 * 2.63%* + Amean fault-both-18 7351.11 ( 0.00%) 6950.51 * 5.45%* + Amean fault-both-24 9059.30 ( 0.00%) 9159.99 * -1.11%* + Amean fault-both-30 10685.68 ( 0.00%) 11399.02 * -6.68%* + +Upstream-Status: Backport [175fe77c Fix: mm_compaction_migratepages changed in linux 6.9-rc1] + +Change-Id: I103a43fd1b549360b3fc978fd409b7c17ef3e192 +Signed-off-by: Kienan Stewart <kstewart@efficios.com> +Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> +--- + include/instrumentation/events/compaction.h | 17 ++++++++++++++++- + 1 file changed, 16 insertions(+), 1 deletion(-) + +Index: lttng-modules-2.13.12/include/instrumentation/events/compaction.h +=================================================================== +--- lttng-modules-2.13.12.orig/include/instrumentation/events/compaction.h ++++ lttng-modules-2.13.12/include/instrumentation/events/compaction.h +@@ -97,7 +97,22 @@ LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(comp + + #endif /* #else #if LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,0,0) */ + +-#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,18,0) || \ ++#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(6,9,0)) ++LTTNG_TRACEPOINT_EVENT_MAP(mm_compaction_migratepages, ++ ++ compaction_migratepages, ++ ++ TP_PROTO(unsigned int nr_migratepages, ++ unsigned int nr_succeeded), ++ ++ TP_ARGS(nr_migratepages, nr_succeeded), ++ ++ TP_FIELDS( ++ ctf_integer(unsigned long, nr_migrated, nr_succeeded) ++ ctf_integer(unsigned long, nr_failed, nr_migratepages - nr_succeeded) ++ ) ++) ++#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,18,0) || \ + LTTNG_RHEL_KERNEL_RANGE(5,14,0,163,0,0, 5,15,0,0,0,0)) + LTTNG_TRACEPOINT_EVENT_MAP(mm_compaction_migratepages, + |