From patchwork Fri Feb 10 21:50:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 13136505 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 DB7CFC636D4 for ; Fri, 10 Feb 2023 21:54:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233392AbjBJVyO (ORCPT ); Fri, 10 Feb 2023 16:54:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233583AbjBJVxy (ORCPT ); Fri, 10 Feb 2023 16:53:54 -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 B1EAA5B76E for ; Fri, 10 Feb 2023 13:53:52 -0800 (PST) Received: by dev0134.prn3.facebook.com (Postfix, from userid 425415) id 8D1306BFC2D9; 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 10/19] mm: calculate ksm process profit metric Date: Fri, 10 Feb 2023 13:50:14 -0800 Message-Id: <20230210215023.2740545-11-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 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The ksm documentation mentions the process profit metric and how to calculate it. This adds the calculation of the metric. Signed-off-by: Stefan Roesch --- include/linux/ksm.h | 4 ++++ mm/ksm.c | 8 ++++++++ 2 files changed, 12 insertions(+) diff --git a/include/linux/ksm.h b/include/linux/ksm.h index d38a05a36298..a18cd03efcfb 100644 --- a/include/linux/ksm.h +++ b/include/linux/ksm.h @@ -55,6 +55,10 @@ struct page *ksm_might_need_to_copy(struct page *page, void rmap_walk_ksm(struct folio *folio, struct rmap_walk_control *rwc); void folio_migrate_ksm(struct folio *newfolio, struct folio *folio); +#ifdef CONFIG_PROC_FS +long ksm_process_profit(struct mm_struct *); +#endif /* CONFIG_PROC_FS */ + #else /* !CONFIG_KSM */ static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm) diff --git a/mm/ksm.c b/mm/ksm.c index a0b4611112c0..b3db29605303 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -3024,6 +3024,14 @@ static void wait_while_offlining(void) } #endif /* CONFIG_MEMORY_HOTREMOVE */ +#ifdef CONFIG_PROC_FS +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); +} +#endif /* CONFIG_PROC_FS */ + #ifdef CONFIG_SYSFS /* * This all compiles without CONFIG_SYSFS, but is a waste of space.