The patch titled
Subject: mm/migration: add trace events for THP migrations
has been added to the -mm tree. Its filename is
mm-migration-add-trace-events-for-thp-migrations.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-migration-add-trace-events-for-thp-migrations.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-migration-add-trace-events-for-thp-migrations.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: mm/migration: add trace events for THP migrations
This adds two trace events for PMD based THP migration without split.
These events closely follow the implementation details like setting and
removing of PMD migration entries, which are essential operations for THP
migration.
Link: https://lkml.kernel.org/r/1641531575-28524-1-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/thp.h | 37 +++++++++++++++++++++++++++++++++++
mm/huge_memory.c | 5 ++++
2 files changed, 42 insertions(+)
--- a/include/trace/events/thp.h~mm-migration-add-trace-events-for-thp-migrations
+++ a/include/trace/events/thp.h
@@ -83,6 +83,43 @@ TRACE_EVENT(hugepage_splitting,
__entry->addr, __entry->pte)
);
+TRACE_EVENT(set_migration_pmd,
+
+ TP_PROTO(unsigned long addr, unsigned long pmd),
+
+ TP_ARGS(addr, pmd),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, addr)
+ __field(unsigned long, pmd)
+ ),
+
+ TP_fast_assign(
+ __entry->addr = addr;
+ __entry->pmd = pmd;
+ ),
+
+ TP_printk("create pmd migration entry addr=%lx, pmd=%lx", __entry->addr, __entry->pmd)
+);
+
+TRACE_EVENT(remove_migration_pmd,
+
+ TP_PROTO(unsigned long addr, unsigned long pmd),
+
+ TP_ARGS(addr, pmd),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, addr)
+ __field(unsigned long, pmd)
+ ),
+
+ TP_fast_assign(
+ __entry->addr = addr;
+ __entry->pmd = pmd;
+ ),
+
+ TP_printk("remove pmd migration entry addr=%lx, val=%lx", __entry->addr, __entry->pmd)
+);
#endif /* _TRACE_THP_H */
/* This part must be outside protection */
--- a/mm/huge_memory.c~mm-migration-add-trace-events-for-thp-migrations
+++ a/mm/huge_memory.c
@@ -39,6 +39,9 @@
#include <asm/pgalloc.h>
#include "internal.h"
+#define CREATE_TRACE_POINTS
+#include <trace/events/thp.h>
+
/*
* By default, transparent hugepage support is disabled in order to avoid
* risking an increased memory footprint for applications that are not
@@ -3163,6 +3166,7 @@ void set_pmd_migration_entry(struct page
set_pmd_at(mm, address, pvmw->pmd, pmdswp);
page_remove_rmap(page, true);
put_page(page);
+ trace_set_migration_pmd(address, pmd_val(pmdswp));
}
void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new)
@@ -3196,5 +3200,6 @@ void remove_migration_pmd(struct page_vm
if ((vma->vm_flags & VM_LOCKED) && !PageDoubleMap(new))
mlock_vma_page(new);
update_mmu_cache_pmd(vma, address, pvmw->pmd);
+ trace_remove_migration_pmd(address, pmd_val(pmde));
}
#endif
_
Patches currently in -mm which might be from anshuman.khandual@xxxxxxx are
mm-page_alloc-modify-the-comment-section-for-alloc_contig_pages.patch
mm-migration-add-trace-events-for-thp-migrations.patch
mm-thp-drop-unused-trace-events-hugepage_.patch
