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
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
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.
Link: https://lkml.kernel.org/r/1643080105-11416-3-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/trace/events/migrate.h | 31 +++++++++++++++++++++++++++++++
mm/migrate.c | 3 +++
mm/rmap.c | 5 +++++
3 files changed, 39 insertions(+)
--- 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
@@ -257,6 +257,9 @@ 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
@@ -77,6 +77,7 @@
#include <asm/tlbflush.h>
#include <trace/events/tlb.h>
+#include <trace/events/migrate.h>
#include "internal.h"
@@ -1861,6 +1862,8 @@ 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 +1932,8 @@ 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@xxxxxxx 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
