+ mm-migration-add-trace-events-for-thp-migrations.patch added to -mm tree

* + mm-migration-add-trace-events-for-thp-migrations.patch added to -mm tree
@ 2022-01-26  0:34 akpm
  0 siblings, 0 replies; 4+ messages in thread
From: akpm @ 2022-01-26  0:34 UTC (permalink / raw)
  To: anshuman.khandual, jhubbard, mingo, mm-commits, n-horiguchi,
	rostedt, willy, ziy


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@arm.com>
Subject: mm/migration: add trace events for THP migrations

Patch series "mm/migration: Add trace events".

This adds trace events for all migration scenarios including base page,
THP and HugeTLB.


This patch (of 2):

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/1643080105-11416-1-git-send-email-anshuman.khandual@arm.com
Link: https://lkml.kernel.org/r/1643080105-11416-2-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.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>
---

 include/trace/events/thp.h |   27 +++++++++++++++++++++++++++
 mm/huge_memory.c           |    5 +++++
 2 files changed, 32 insertions(+)

--- a/include/trace/events/thp.h~mm-migration-add-trace-events-for-thp-migrations
+++ a/include/trace/events/thp.h
@@ -48,6 +48,33 @@ TRACE_EVENT(hugepage_update,
 	    TP_printk("hugepage update at addr 0x%lx and pte = 0x%lx clr = 0x%lx, set = 0x%lx", __entry->addr, __entry->pte, __entry->clr, __entry->set)
 );
 
+DECLARE_EVENT_CLASS(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("addr=%lx, pmd=%lx", __entry->addr, __entry->pmd)
+);
+
+DEFINE_EVENT(migration_pmd, set_migration_pmd,
+	TP_PROTO(unsigned long addr, unsigned long pmd),
+	TP_ARGS(addr, pmd)
+);
+
+DEFINE_EVENT(migration_pmd, remove_migration_pmd,
+	TP_PROTO(unsigned long addr, unsigned long pmd),
+	TP_ARGS(addr, 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
@@ -3173,6 +3176,7 @@ 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)
@@ -3206,5 +3210,6 @@ 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@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
mm-migration-add-trace-events-for-base-page-and-hugetlb-migrations-fix.patch


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