From patchwork Mon Jan 23 17:37:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 13112705 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 5F1B2C38142 for ; Mon, 23 Jan 2023 18:06:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233763AbjAWSGi (ORCPT ); Mon, 23 Jan 2023 13:06:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233580AbjAWSGc (ORCPT ); Mon, 23 Jan 2023 13:06:32 -0500 Received: from 66-220-144-178.mail-mxout.facebook.com (66-220-144-178.mail-mxout.facebook.com [66.220.144.178]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2B5DF31E01 for ; Mon, 23 Jan 2023 10:06:13 -0800 (PST) Received: by dev0134.prn3.facebook.com (Postfix, from userid 425415) id 6F5EE5616BE9; Mon, 23 Jan 2023 09:37:56 -0800 (PST) From: Stefan Roesch To: linux-mm@kvack.org Cc: shr@devkernel.io, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [RESEND RFC PATCH v1 12/20] mm: add ksm_merge_type() function Date: Mon, 23 Jan 2023 09:37:40 -0800 Message-Id: <20230123173748.1734238-13-shr@devkernel.io> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230123173748.1734238-1-shr@devkernel.io> References: <20230123173748.1734238-1-shr@devkernel.io> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org This adds the ksm_merge_type function. The function returns the merge type for the process. For madvise it returns "madvise", for prctl it returns "process" and otherwise it returns "none". Signed-off-by: Stefan Roesch --- include/linux/ksm.h | 1 + mm/ksm.c | 11 +++++++++++ 2 files changed, 12 insertions(+) diff --git a/include/linux/ksm.h b/include/linux/ksm.h index a18cd03efcfb..d5f69f18ee5a 100644 --- a/include/linux/ksm.h +++ b/include/linux/ksm.h @@ -57,6 +57,7 @@ void folio_migrate_ksm(struct folio *newfolio, struct folio *folio); #ifdef CONFIG_PROC_FS long ksm_process_profit(struct mm_struct *); +const char *ksm_merge_type(struct mm_struct *mm); #endif /* CONFIG_PROC_FS */ #else /* !CONFIG_KSM */ diff --git a/mm/ksm.c b/mm/ksm.c index 288689b59527..57183deaf529 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -2941,6 +2941,17 @@ long ksm_process_profit(struct mm_struct *mm) return (long)mm->ksm_merging_pages * PAGE_SIZE - mm->ksm_rmap_items * sizeof(struct ksm_rmap_item); } + +/* Return merge type name as string. */ +const char *ksm_merge_type(struct mm_struct *mm) +{ + if (test_bit(MMF_VM_MERGE_ANY, &mm->flags)) + return "process"; + else if (test_bit(MMF_VM_MERGEABLE, &mm->flags)) + return "madvise"; + else + return "none"; +} #endif /* CONFIG_PROC_FS */ #ifdef CONFIG_SYSFS