From patchwork Tue Oct 11 01:00:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 13003489 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 C3EC7C4332F for ; Tue, 11 Oct 2022 01:01:37 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 443EE900008; Mon, 10 Oct 2022 21:01:30 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3EB22900005; Mon, 10 Oct 2022 21:01:30 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F126E90000A; Mon, 10 Oct 2022 21:01:29 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id BB636900005 for ; Mon, 10 Oct 2022 21:01:29 -0400 (EDT) Received: from smtpin07.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 65976A0D6E for ; Tue, 11 Oct 2022 01:01:29 +0000 (UTC) X-FDA: 80006865498.07.912029C Received: from 66-220-144-178.mail-mxout.facebook.com (66-220-144-178.mail-mxout.facebook.com [66.220.144.178]) by imf25.hostedemail.com (Postfix) with ESMTP id B8492A0021 for ; Tue, 11 Oct 2022 01:01:28 +0000 (UTC) Received: by dev1180.prn1.facebook.com (Postfix, from userid 425415) id 2466A34BDDE2; Mon, 10 Oct 2022 18:01:06 -0700 (PDT) From: Stefan Roesch To: kernel-team@fb.com, linux-block@vger.kernel.org, linux-mm@kvack.org Cc: shr@devkernel.io, axboe@kernel.dk, clm@meta.com Subject: [RFC PATCH v1 10/14] mm: add bdi_get_min_bytes() function. Date: Mon, 10 Oct 2022 18:00:40 -0700 Message-Id: <20221011010044.851537-11-shr@devkernel.io> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221011010044.851537-1-shr@devkernel.io> References: <20221011010044.851537-1-shr@devkernel.io> MIME-Version: 1.0 ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1665450088; a=rsa-sha256; cv=none; b=60CuAPnvNrZl5cwZqZhEh1xo2LD3gEiPM2DZKmERyhsWpm0tSqRbEe4E2+IuMs7A82Y02i gB8tgLms6vO5uoT1PuNDZ7lbEMTXq5X1/vD+i5vkE0kvqMkz67tggv0yCTXbZ2EaJKiYU5 DTRfi2py5qx4Rr/nm0L2sXt/iYfg+oA= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=none; dmarc=none; spf=neutral (imf25.hostedemail.com: 66.220.144.178 is neither permitted nor denied by domain of shr@devkernel.io) smtp.mailfrom=shr@devkernel.io ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1665450088; 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=pLxfc6prB2JeUA+HemeduNZ2qP6Byk3PNBbrBtVfzSY=; b=ZrM+UWwWBMBLD7g8NBPStu8HBvLAgAeiXPg2hvaOGOKxmQFEVECfVsMsuEZ0aidZSAHRxL dxncXXiPujkyTnlUfiXhtYcmL/RT1ZNTBrsH/17JPEWxxD3DZizugdd1UtXBHVKFpkcTrR fAzF3S4QL+tWnXR6eaarqch1Y7T4laA= X-Stat-Signature: 7w65rni4bsudg75tdu76j5gk4qawwbdw X-Rspamd-Queue-Id: B8492A0021 Authentication-Results: imf25.hostedemail.com; dkim=none; dmarc=none; spf=neutral (imf25.hostedemail.com: 66.220.144.178 is neither permitted nor denied by domain of shr@devkernel.io) smtp.mailfrom=shr@devkernel.io X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1665450088-611893 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 a function to return the specified value for min_bytes. It converts the stored min_ratio of the bdi to the corresponding bytes value. This is an approximation as it is based on the value that is returned by global_dirty_limits(), which can change. The returned value can be different than the value when the min_bytes value was set. Signed-off-by: Stefan Roesch --- include/linux/backing-dev.h | 1 + mm/page-writeback.c | 6 ++++++ 2 files changed, 7 insertions(+) diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index a10598f90d4d..cdb131b57fcb 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -105,6 +105,7 @@ static inline unsigned long wb_stat_error(void) /* BDI ratio is expressed as part per 10000 for finer granularity. */ #define BDI_RATIO_SCALE 100 +unsigned long long bdi_get_min_bytes(struct backing_dev_info *bdi); unsigned long long bdi_get_max_bytes(struct backing_dev_info *bdi); int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio); int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); diff --git a/mm/page-writeback.c b/mm/page-writeback.c index a6594ebdcbd8..a37a25994ad8 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -739,6 +739,12 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio) } EXPORT_SYMBOL(bdi_set_max_ratio); +unsigned long long bdi_get_min_bytes(struct backing_dev_info *bdi) +{ + return bdi_get_bytes(bdi->min_ratio); +} +EXPORT_SYMBOL_GPL(bdi_get_min_bytes); + unsigned long long bdi_get_max_bytes(struct backing_dev_info *bdi) { return bdi_get_bytes(bdi->max_ratio);