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 X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D6D60C433E4 for ; Sat, 20 Mar 2021 05:45:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AFC1C6199C for ; Sat, 20 Mar 2021 05:45:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230146AbhCTFnn (ORCPT ); Sat, 20 Mar 2021 01:43:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54206 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230218AbhCTFnZ (ORCPT ); Sat, 20 Mar 2021 01:43:25 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E05DAC061762; Fri, 19 Mar 2021 22:43:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=elZnjGaYDjPwKSSSm76I3MI9c9nGwtkyXulavWZGeYk=; b=lN6RH7vmCPaZl//sn5tbrC+dyP pX8/nLMZEHEUaWHOLw32NFvDtwPZZrl7Hirc0WrlzxC9Us3m9cZteCxcNpF9WryKHVJAdJ9QK49Ze E84TQeiAqTMpxQHSgTtuOJwyVs0/7/PBdjFyaTPLY3Azh+VX9xA69K/KVFbzkIzr+NTAM7kOeV0oc rHhFJutidRUkT30VMDrs2LKcrQbSmF2qFw6Me32vgBd1oe8X7HguX2uFcVwAgbQ+dW9GqmBvzViq6 zO55S3nlMh4j4KrYnT0pSAKD0cXVZVE1DdM/vdcgP8OMXYGlo2IuwccUQrouxaK1X4SlzXnUGyEbD mRtdlZVQ==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lNUO4-005ScR-HW; Sat, 20 Mar 2021 05:43:01 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-cachefs@redhat.com, linux-afs@lists.infradead.org Subject: [PATCH v5 17/27] mm/filemap: Add lock_folio_killable Date: Sat, 20 Mar 2021 05:40:54 +0000 Message-Id: <20210320054104.1300774-18-willy@infradead.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210320054104.1300774-1-willy@infradead.org> References: <20210320054104.1300774-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is like lock_page_killable() but for use by callers who know they have a folio. Convert __lock_page_killable() to be __lock_folio_killable(). This saves one call to compound_head() per contended call to lock_page_killable(). __lock_folio_killable() is 20 bytes smaller than __lock_page_killable() was. lock_page_maybe_drop_mmap() shrinks by 68 bytes and __lock_page_or_retry() shrinks by 66 bytes. That's a total of 154 bytes of text saved. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/pagemap.h | 15 ++++++++++----- mm/filemap.c | 17 +++++++++-------- 2 files changed, 19 insertions(+), 13 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index c96ba0dfe111..aa7f564e5ecf 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -694,7 +694,7 @@ static inline bool wake_page_match(struct wait_page_queue *wait_page, } void __lock_folio(struct folio *folio); -extern int __lock_page_killable(struct page *page); +int __lock_folio_killable(struct folio *folio); extern int __lock_page_async(struct page *page, struct wait_page_queue *wait); extern int __lock_page_or_retry(struct page *page, struct mm_struct *mm, unsigned int flags); @@ -735,6 +735,14 @@ static inline void lock_page(struct page *page) __lock_folio(folio); } +static inline int lock_folio_killable(struct folio *folio) +{ + might_sleep(); + if (!trylock_folio(folio)) + return __lock_folio_killable(folio); + return 0; +} + /* * lock_page_killable is like lock_page but can be interrupted by fatal * signals. It returns 0 if it locked the page and -EINTR if it was @@ -742,10 +750,7 @@ static inline void lock_page(struct page *page) */ static inline int lock_page_killable(struct page *page) { - might_sleep(); - if (!trylock_page(page)) - return __lock_page_killable(page); - return 0; + return lock_folio_killable(page_folio(page)); } /* diff --git a/mm/filemap.c b/mm/filemap.c index 99c05e2c0eea..7cac47db78a5 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1546,14 +1546,13 @@ void __lock_folio(struct folio *folio) } EXPORT_SYMBOL(__lock_folio); -int __lock_page_killable(struct page *__page) +int __lock_folio_killable(struct folio *folio) { - struct page *page = compound_head(__page); - wait_queue_head_t *q = page_waitqueue(page); - return wait_on_page_bit_common(q, page, PG_locked, TASK_KILLABLE, + wait_queue_head_t *q = page_waitqueue(&folio->page); + return wait_on_page_bit_common(q, &folio->page, PG_locked, TASK_KILLABLE, EXCLUSIVE); } -EXPORT_SYMBOL_GPL(__lock_page_killable); +EXPORT_SYMBOL_GPL(__lock_folio_killable); int __lock_page_async(struct page *page, struct wait_page_queue *wait) { @@ -1595,6 +1594,8 @@ int __lock_page_async(struct page *page, struct wait_page_queue *wait) int __lock_page_or_retry(struct page *page, struct mm_struct *mm, unsigned int flags) { + struct folio *folio = page_folio(page); + if (fault_flag_allow_retry_first(flags)) { /* * CAUTION! In this case, mmap_lock is not released @@ -1613,13 +1614,13 @@ int __lock_page_or_retry(struct page *page, struct mm_struct *mm, if (flags & FAULT_FLAG_KILLABLE) { int ret; - ret = __lock_page_killable(page); + ret = __lock_folio_killable(folio); if (ret) { mmap_read_unlock(mm); return 0; } } else { - __lock_folio(page_folio(page)); + __lock_folio(folio); } return 1; @@ -2781,7 +2782,7 @@ static int lock_page_maybe_drop_mmap(struct vm_fault *vmf, struct page *page, *fpin = maybe_unlock_mmap_for_io(vmf, *fpin); if (vmf->flags & FAULT_FLAG_KILLABLE) { - if (__lock_page_killable(&folio->page)) { + if (__lock_folio_killable(folio)) { /* * We didn't have the right flags to drop the mmap_lock, * but all fault_handlers only check for fatal signals -- 2.30.2