linux-kernel - [RFC] Add gup trace points support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1449011177-30686-1-git-send-email-yang.shi@linaro.org>
Date:	Tue,  1 Dec 2015 15:06:10 -0800
From:	Yang Shi <yang.shi@...aro.org>
To:	akpm@...ux-foundation.org, rostedt@...dmis.org, mingo@...hat.com
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linaro-kernel@...ts.linaro.org, yang.shi@...aro.org
Subject: [RFC] Add gup trace points support

Some background about why I think this might be useful.

When I was profiling some hugetlb related program, I got page-faults event
doubled when hugetlb is enabled. When I looked into the code, I found page-faults
come from two places, do_page_fault and gup. So, I tried to figure out which
play a role (or both) in my use case. But I can't find existing finer tracing
event for sub page-faults in current mainline kernel.

So, I added the gup trace points support to have finer tracing events for
page-faults. The below events are added:

__get_user_pages
__get_user_pages_fast
fixup_user_fault

Both __get_user_pages and fixup_user_fault call handle_mm_fault.

Just added trace points to raw version __get_user_pages since all variants
will call it finally to do real work.

Although __get_user_pages_fast doesn't call handle_mm_fault, it might be useful
to have it to distinguish between slow and fast version.

Yang Shi (7):
      trace/events: Add gup trace events
      mm/gup: add gup trace points
      x86: mm/gup: add gup trace points
      mips: mm/gup: add gup trace points
      s390: mm/gup: add gup trace points
      sh: mm/gup: add gup trace points
      sparc64: mm/gup: add gup trace points

 arch/mips/mm/gup.c         |  7 +++++++
 arch/s390/mm/gup.c         |  7 +++++++
 arch/sh/mm/gup.c           |  8 ++++++++
 arch/sparc/mm/gup.c        |  8 ++++++++
 arch/x86/mm/gup.c          |  7 +++++++
 include/trace/events/gup.h | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 mm/gup.c                   |  8 ++++++++
 7 files changed, 122 insertions(+)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/