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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 523F4C636D4 for ; Fri, 10 Feb 2023 21:51:01 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 7CD98280019; Fri, 10 Feb 2023 16:50:59 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 75580280003; Fri, 10 Feb 2023 16:50:59 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 58293280019; Fri, 10 Feb 2023 16:50:59 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 3C5B7280003 for ; Fri, 10 Feb 2023 16:50:59 -0500 (EST) Received: from smtpin07.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id EFAA4AB897 for ; Fri, 10 Feb 2023 21:50:58 +0000 (UTC) X-FDA: 80452727796.07.DE128D0 Received: from 66-220-144-178.mail-mxout.facebook.com (66-220-144-178.mail-mxout.facebook.com [66.220.144.178]) by imf01.hostedemail.com (Postfix) with ESMTP id 6D8DC40013 for ; Fri, 10 Feb 2023 21:50:57 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=none; spf=neutral (imf01.hostedemail.com: 66.220.144.178 is neither permitted nor denied by domain of shr@devkernel.io) smtp.mailfrom=shr@devkernel.io; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1676065857; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=chvrXV9yZzpHfS2K0VAXtwsTCxlMcxeeH9oMULv/YAE=; b=0bhg7R1v+b0rCjAj+FJA6EvI+6AVgmJgAz+mO6ly9TdqdPAWOmdNNTyJ8unhHgKTTIbpoq Ouhbz0OAcNRC9lquoINy+4KOVCS8vAJMuL+QC977/uNqCCajLJnsPvgC3ck54RV99ajJRw IB5SJXZeSo0IJkhfSJMiiCd4+9aAg7w= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=none; spf=neutral (imf01.hostedemail.com: 66.220.144.178 is neither permitted nor denied by domain of shr@devkernel.io) smtp.mailfrom=shr@devkernel.io; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1676065857; a=rsa-sha256; cv=none; b=LLR3K5Z+wPPNcEymh7c60ZstVk93qnrvPDlVUXMGPhx4IoFZehRfaFumHDVd5NQkCbJ+V2 Hpsr35Sk6xTLr/kKxMLYHXNQNlcPU16I/XM3+HfqZVlbuexxoHqzdr8k+FKjiWdXCOAYf2 djaYjlXGNbMinid5azlM1xHnaYdt5KM= Received: by dev0134.prn3.facebook.com (Postfix, from userid 425415) id 776656BFC2CF; Fri, 10 Feb 2023 13:50:33 -0800 (PST) From: Stefan Roesch To: kernel-team@fb.com Cc: shr@devkernel.io, linux-mm@kvack.org, riel@surriel.com, mhocko@suse.com, david@redhat.com, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, akpm@linux-foundation.org Subject: [RFC PATCH v2 05/19] mm: support disabling of ksm for a process Date: Fri, 10 Feb 2023 13:50:09 -0800 Message-Id: <20230210215023.2740545-6-shr@devkernel.io> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230210215023.2740545-1-shr@devkernel.io> References: <20230210215023.2740545-1-shr@devkernel.io> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Stat-Signature: mugau6ynycdkwo94ah16icpo3ecz349z X-Rspam-User: X-Rspamd-Queue-Id: 6D8DC40013 X-Rspamd-Server: rspam06 X-HE-Tag: 1676065857-754589 X-HE-Meta: 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 pRNT+V7k iSpPtef7A6VOWoUGVrzqQxTXdLn71j2CF9QqXKwNn4Xk9AvY= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This adds the ability to disable ksm for a process if ksm has been enabled for the process. Signed-off-by: Stefan Roesch --- mm/ksm.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/mm/ksm.c b/mm/ksm.c index efd8d3804de3..23d6944f78ad 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -2690,6 +2690,27 @@ int __ksm_enter(struct mm_struct *mm, int flag) return 0; } =20 +static void unmerge_vmas(struct mm_struct *mm) +{ + struct vm_area_struct *vma; + struct vma_iterator vmi; + + vma_iter_init(&vmi, mm, 0); + + mmap_read_lock(mm); + for_each_vma(vmi, vma) { + if (vma->vm_flags & VM_MERGEABLE) { + unsigned long flags =3D vma->vm_flags; + + if (ksm_madvise(vma, vma->vm_start, vma->vm_end, MADV_UNMERGEABLE, &f= lags)) + continue; + + vm_flags_clear(vma, VM_MERGEABLE); + } + } + mmap_read_unlock(mm); +} + void __ksm_exit(struct mm_struct *mm, int flag) { struct ksm_mm_slot *mm_slot; @@ -2697,8 +2718,10 @@ void __ksm_exit(struct mm_struct *mm, int flag) int easy_to_free =3D 0; =20 if (!(current->flags & PF_EXITING) && flag =3D=3D MMF_VM_MERGE_ANY && - test_bit(MMF_VM_MERGE_ANY, &mm->flags)) + test_bit(MMF_VM_MERGE_ANY, &mm->flags)) { clear_bit(MMF_VM_MERGE_ANY, &mm->flags); + unmerge_vmas(mm); + } =20 /* * This process is exiting: if it's straightforward (as is the --=20 2.30.2