[PATCH 2/5] mm: introduce save_page_flags to cooperate with show_page_flags
From: Muchun Song <hidden>
Date: 2021-07-14 09:21:09
Also in:
linux-doc, lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
Introduce save_page_flags to return the page flags which can cooperate with show_page_flags. If we want to hihe some page flags from users, it will be useful to alter save_page_flags directly. This is a preparation for the next patch to hide some page flags from users. Signed-off-by: Muchun Song <redacted> --- include/trace/events/mmflags.h | 3 +++ include/trace/events/page_ref.h | 8 ++++---- 2 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index 390270e00a1d..69cb84b1257e 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h@@ -121,6 +121,9 @@ IF_HAVE_PG_IDLE(PG_idle, "idle" ) \ IF_HAVE_PG_ARCH_2(PG_arch_2, "arch_2" ) \ IF_HAVE_PG_SKIP_KASAN_POISON(PG_skip_kasan_poison, "skip_kasan_poison") +#define save_page_flags(page) \ + (((page)->flags & ~PAGEFLAGS_MASK)) + #define show_page_flags(flags) \ (flags) ? __print_flags(flags, "|", \ __def_pageflag_names \
diff --git a/include/trace/events/page_ref.h b/include/trace/events/page_ref.h
index 643b1b4e9f27..53d303048d27 100644
--- a/include/trace/events/page_ref.h
+++ b/include/trace/events/page_ref.h@@ -28,7 +28,7 @@ DECLARE_EVENT_CLASS(page_ref_mod_template, TP_fast_assign( __entry->pfn = page_to_pfn(page); - __entry->flags = page->flags; + __entry->flags = save_page_flags(page); __entry->count = page_ref_count(page); __entry->mapcount = page_mapcount(page); __entry->mapping = page->mapping;
@@ -38,7 +38,7 @@ DECLARE_EVENT_CLASS(page_ref_mod_template, TP_printk("pfn=0x%lx flags=%s count=%d mapcount=%d mapping=%p mt=%d val=%d", __entry->pfn, - show_page_flags(__entry->flags & ~PAGEFLAGS_MASK), + show_page_flags(__entry->flags), __entry->count, __entry->mapcount, __entry->mapping, __entry->mt, __entry->val)
@@ -77,7 +77,7 @@ DECLARE_EVENT_CLASS(page_ref_mod_and_test_template, TP_fast_assign( __entry->pfn = page_to_pfn(page); - __entry->flags = page->flags; + __entry->flags = save_page_flags(page); __entry->count = page_ref_count(page); __entry->mapcount = page_mapcount(page); __entry->mapping = page->mapping;
@@ -88,7 +88,7 @@ DECLARE_EVENT_CLASS(page_ref_mod_and_test_template, TP_printk("pfn=0x%lx flags=%s count=%d mapcount=%d mapping=%p mt=%d val=%d ret=%d", __entry->pfn, - show_page_flags(__entry->flags & ~PAGEFLAGS_MASK), + show_page_flags(__entry->flags), __entry->count, __entry->mapcount, __entry->mapping, __entry->mt, __entry->val, __entry->ret)
--
2.11.0