+ mm-migration-add-trace-events-for-base-page-and-hugetlb-migrations.patch added to -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/migration: add trace events for base page and HugeTLB migrations
has been added to the -mm tree.  Its filename is
     mm-migration-add-trace-events-for-base-page-and-hugetlb-migrations.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-migration-add-trace-events-for-base-page-and-hugetlb-migrations.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-migration-add-trace-events-for-base-page-and-hugetlb-migrations.patch

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@arm.com>
Subject: mm/migration: add trace events for base page and HugeTLB migrations

This adds two trace events for base page and HugeTLB page migrations. 
These events, closely follow the implementation details like setting and
removing of PTE migration entries, which are essential operations for
migration.  The new CREATE_TRACE_POINTS in <mm/rmap.c> covers both
<events/migration.h> and <events/tlb.h> based trace events.  Hence drop
redundant CREATE_TRACE_POINTS from other places which could have otherwise
conflicted during build.

Link: https://lkml.kernel.org/r/1643368182-9588-3-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/x86/mm/init.c             |    1 -
 include/trace/events/migrate.h |   31 +++++++++++++++++++++++++++++++
 mm/migrate.c                   |    4 +++-
 mm/rmap.c                      |    6 ++++++
 4 files changed, 40 insertions(+), 2 deletions(-)

--- a/arch/x86/mm/init.c~mm-migration-add-trace-events-for-base-page-and-hugetlb-migrations
+++ a/arch/x86/mm/init.c
@@ -31,7 +31,6 @@
  * We need to define the tracepoints somewhere, and tlb.c
  * is only compiled when SMP=y.
  */
-#define CREATE_TRACE_POINTS
 #include <trace/events/tlb.h>
 
 #include "mm_internal.h"
--- a/include/trace/events/migrate.h~mm-migration-add-trace-events-for-base-page-and-hugetlb-migrations
+++ a/include/trace/events/migrate.h
@@ -105,6 +105,37 @@ TRACE_EVENT(mm_migrate_pages_start,
 		  __print_symbolic(__entry->reason, MIGRATE_REASON))
 );
 
+DECLARE_EVENT_CLASS(migration_pte,
+
+		TP_PROTO(unsigned long addr, unsigned long pte, int order),
+
+		TP_ARGS(addr, pte, order),
+
+		TP_STRUCT__entry(
+			__field(unsigned long, addr)
+			__field(unsigned long, pte)
+			__field(int, order)
+		),
+
+		TP_fast_assign(
+			__entry->addr = addr;
+			__entry->pte = pte;
+			__entry->order = order;
+		),
+
+		TP_printk("addr=%lx, pte=%lx order=%d", __entry->addr, __entry->pte, __entry->order)
+);
+
+DEFINE_EVENT(migration_pte, set_migration_pte,
+	TP_PROTO(unsigned long addr, unsigned long pte, int order),
+	TP_ARGS(addr, pte, order)
+);
+
+DEFINE_EVENT(migration_pte, remove_migration_pte,
+	TP_PROTO(unsigned long addr, unsigned long pte, int order),
+	TP_ARGS(addr, pte, order)
+);
+
 #endif /* _TRACE_MIGRATE_H */
 
 /* This part must be outside protection */
--- a/mm/migrate.c~mm-migration-add-trace-events-for-base-page-and-hugetlb-migrations
+++ a/mm/migrate.c
@@ -54,7 +54,6 @@
 
 #include <asm/tlbflush.h>
 
-#define CREATE_TRACE_POINTS
 #include <trace/events/migrate.h>
 
 #include "internal.h"
@@ -257,6 +256,9 @@ static bool remove_migration_pte(struct
 		if (PageTransHuge(page) && PageMlocked(page))
 			clear_page_mlock(page);
 
+		trace_remove_migration_pte(pvmw.address, pte_val(pte),
+					   compound_order(new));
+
 		/* No need to invalidate - it was non-present before */
 		update_mmu_cache(vma, pvmw.address, pvmw.pte);
 	}
--- a/mm/rmap.c~mm-migration-add-trace-events-for-base-page-and-hugetlb-migrations
+++ a/mm/rmap.c
@@ -76,7 +76,9 @@
 
 #include <asm/tlbflush.h>
 
+#define CREATE_TRACE_POINTS
 #include <trace/events/tlb.h>
+#include <trace/events/migrate.h>
 
 #include "internal.h"
 
@@ -1861,6 +1863,8 @@ static bool try_to_migrate_one(struct pa
 			if (pte_swp_uffd_wp(pteval))
 				swp_pte = pte_swp_mkuffd_wp(swp_pte);
 			set_pte_at(mm, pvmw.address, pvmw.pte, swp_pte);
+			trace_set_migration_pte(pvmw.address, pte_val(swp_pte),
+						compound_order(page));
 			/*
 			 * No need to invalidate here it will synchronize on
 			 * against the special swap migration pte.
@@ -1929,6 +1933,8 @@ static bool try_to_migrate_one(struct pa
 			if (pte_uffd_wp(pteval))
 				swp_pte = pte_swp_mkuffd_wp(swp_pte);
 			set_pte_at(mm, address, pvmw.pte, swp_pte);
+			trace_set_migration_pte(address, pte_val(swp_pte),
+						compound_order(page));
 			/*
 			 * No need to invalidate here it will synchronize on
 			 * against the special swap migration pte.
_

Patches currently in -mm which might be from anshuman.khandual@arm.com are

mm-generalize-arch_has_filter_pgprot.patch
mm-migration-add-trace-events-for-thp-migrations.patch
mm-migration-add-trace-events-for-base-page-and-hugetlb-migrations.patch