| From: |
| Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> |
| To: |
| Andrew Morton <akpm@linux-foundation.org> |
| Subject: |
| [RFC][PATCH 0/3] mm: introduce fincore() |
| Date: |
| Mon, 2 Jun 2014 01:24:56 -0400 |
| Message-ID: |
| <1401686699-9723-1-git-send-email-n-horiguchi@ah.jp.nec.com> |
| Cc: |
| Konstantin Khlebnikov <koct9i@gmail.com>, Wu Fengguang <fengguang.wu@intel.com>, Arnaldo Carvalho de Melo <acme@redhat.com>, Borislav Petkov <bp@alien8.de>, "Kirill A. Shutemov" <kirill@shutemov.name>, Johannes Weiner <hannes@cmpxchg.org>, Rusty Russell <rusty@rustcorp.com.au>, David Miller <davem@davemloft.net>, Andres Freund <andres@2ndquadrant.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org |
| Archive‑link: | |
Article |
Due to the previous discussion[1], I learned that you people have discussed
this system call a few times (but not conclusion) and it can solve my problem
about pagecache scanning (see[2] for my motivation.) So I try it now.
The main patch of this patchset is patch 2, and this is based on Johannes's
previous version[3], so I CCed people who joined that discussion. While there
might be controversies about the format of data copied from kernel to userspace,
I take the Kirill's suggestion[4] which uses a flag to choose the data format,
which is extensible and flexible (you can cut off some info if you don't need it.)
And I added simple tests at patch 3, and patch 2 passes all the tests.
Any comments are welcomed.
[1] http://marc.info/?l=linux-kernel&m=140072606903894&...
[2] http://marc.info/?l=linux-mm&m=140072522603776&w=2
[3] http://thread.gmane.org/gmane.linux.kernel/1439212/focus=...
[4] http://marc.info/?l=linux-kernel&m=140075509611532&...
Thanks,
Naoya Horiguchi
---
Summary:
Naoya Horiguchi (3):
replace PAGECACHE_TAG_* definition with enumeration
mm: introduce fincore()
selftest: add test code for fincore()
arch/x86/syscalls/syscall_64.tbl | 1 +
include/linux/fs.h | 9 +-
include/linux/syscalls.h | 2 +
mm/Makefile | 2 +-
mm/fincore.c | 362 +++++++++++++++++++++
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/fincore/Makefile | 31 ++
.../selftests/fincore/create_hugetlbfs_file.c | 49 +++
tools/testing/selftests/fincore/fincore.c | 153 +++++++++
tools/testing/selftests/fincore/run_fincoretests | 355 ++++++++++++++++++++
10 files changed, 961 insertions(+), 4 deletions(-)
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