From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f173.google.com (mail-wi0-f173.google.com [209.85.212.173]) by kanga.kvack.org (Postfix) with ESMTP id 2E0986B0253 for ; Mon, 14 Sep 2015 15:32:17 -0400 (EDT) Received: by wicgb1 with SMTP id gb1so155550427wic.1 for ; Mon, 14 Sep 2015 12:32:16 -0700 (PDT) Received: from mail-wi0-x234.google.com (mail-wi0-x234.google.com. [2a00:1450:400c:c05::234]) by mx.google.com with ESMTPS id p7si19245439wij.5.2015.09.14.12.32.15 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 14 Sep 2015 12:32:15 -0700 (PDT) Received: by wicge5 with SMTP id ge5so156601401wic.0 for ; Mon, 14 Sep 2015 12:32:15 -0700 (PDT) From: Ebru Akagunduz Subject: [RFC v5 0/3] mm: make swapin readahead to gain more thp performance Date: Mon, 14 Sep 2015 22:31:42 +0300 Message-Id: <1442259105-4420-1-git-send-email-ebru.akagunduz@gmail.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, n-horiguchi@ah.jp.nec.com, aarcange@redhat.com, riel@redhat.com, iamjoonsoo.kim@lge.com, xiexiuqi@huawei.com, gorcunov@openvz.org, linux-kernel@vger.kernel.org, mgorman@suse.de, rientjes@google.com, vbabka@suse.cz, aneesh.kumar@linux.vnet.ibm.com, hughd@google.com, hannes@cmpxchg.org, mhocko@suse.cz, boaz@plexistor.com, raindel@mellanox.com, Ebru Akagunduz This patch series makes swapin readahead up to a certain number to gain more thp performance and adds tracepoint for khugepaged_scan_pmd, collapse_huge_page, __collapse_huge_page_isolate. This patch series was written to deal with programs that access most, but not all, of their memory after they get swapped out. Currently these programs do not get their memory collapsed into THPs after the system swapped their memory out, while they would get THPs before swapping happened. This patch series was tested with a test program, it allocates 400MB of memory, writes to it, and then sleeps. I force the system to swap out all. Afterwards, the test program touches the area by writing and leaves a piece of it without writing. This shows how much swap in readahead made by the patch. Test results: After swapped out ------------------------------------------------------------------- | Anonymous | AnonHugePages | Swap | Fraction | ------------------------------------------------------------------- With patch | 90076 kB | 88064 kB | 309928 kB | %99 | ------------------------------------------------------------------- Without patch | 194068 kB | 192512 kB | 205936 kB | %99 | ------------------------------------------------------------------- After swapped in ------------------------------------------------------------------- | Anonymous | AnonHugePages | Swap | Fraction | ------------------------------------------------------------------- With patch | 201408 kB | 198656 kB | 198596 kB | %98 | ------------------------------------------------------------------- Without patch | 292624 kB | 192512 kB | 107380 kB | %65 | ------------------------------------------------------------------- Ebru Akagunduz (3): mm: add tracepoint for scanning pages mm: make optimistic check for swapin readahead mm: make swapin readahead to improve thp collapse rate include/trace/events/huge_memory.h | 165 ++++++++++++++++++++++++ mm/huge_memory.c | 248 ++++++++++++++++++++++++++++++++----- mm/internal.h | 4 + mm/memory.c | 2 +- 4 files changed, 386 insertions(+), 33 deletions(-) create mode 100644 include/trace/events/huge_memory.h -- 1.9.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org