From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 893DBCE7A89 for ; Fri, 22 Sep 2023 21:12:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229870AbjIVVMM (ORCPT ); Fri, 22 Sep 2023 17:12:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51244 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229744AbjIVVMJ (ORCPT ); Fri, 22 Sep 2023 17:12:09 -0400 Received: from 66-220-144-179.mail-mxout.facebook.com (66-220-144-179.mail-mxout.facebook.com [66.220.144.179]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BFD64C1 for ; Fri, 22 Sep 2023 14:12:03 -0700 (PDT) Received: by devbig1114.prn1.facebook.com (Postfix, from userid 425415) id CA938C60DC47; Fri, 22 Sep 2023 14:11:49 -0700 (PDT) From: Stefan Roesch To: kernel-team@fb.com Cc: shr@devkernel.io, akpm@linux-foundation.org, david@redhat.com, hannes@cmpxchg.org, riel@surriel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v4 0/2] mm/ksm: add fork-exec support for prctl Date: Fri, 22 Sep 2023 14:11:39 -0700 Message-Id: <20230922211141.320789-1-shr@devkernel.io> X-Mailer: git-send-email 2.39.3 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A process can enable KSM with the prctl system call. When the process is forked the KSM flag is inherited by the child process. However if the process is executing an exec system call directly after the fork, the KSM setting is cleared. This patch series addresses this problem. 1) Change the mask in coredump.h for execing a new process 2) Add a new test case in ksm_functional_tests Changes: - V4: - Added motivation for the fix to the commit message of the first patch - V3: - Combined two lines in function ksm_fork_exec_child() - V2: - Removed the child program from the patch series - Child program is implemented by the program itself - Added a new command line parameter for the child program - Removed new section from Makefile - Removed duplicate ; charaters - Added return in if clause - Used PR_GET_MEMORY_MERGE instead of magic numbers - Resetting PR_SET_MEMROY_MERGE at the end. Stefan Roesch (2): mm/ksm: support fork/exec for prctl mm/ksm: Test case for prctl fork/exec workflow include/linux/sched/coredump.h | 7 +- .../selftests/mm/ksm_functional_tests.c | 66 ++++++++++++++++++- 2 files changed, 70 insertions(+), 3 deletions(-) base-commit: 15bcc9730fcd7526a3b92eff105d6701767a53bb --=20 2.39.3