From patchwork Thu Sep 22 22:40:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zach O'Keefe X-Patchwork-Id: 12985909 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 0C905C6FA86 for ; Thu, 22 Sep 2022 22:41:02 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id F066694000E; Thu, 22 Sep 2022 18:41:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E8EAA940007; Thu, 22 Sep 2022 18:41:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D078294000E; Thu, 22 Sep 2022 18:41:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id BF9B9940007 for ; Thu, 22 Sep 2022 18:41:00 -0400 (EDT) Received: from smtpin12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 98D601209B5 for ; Thu, 22 Sep 2022 22:41:00 +0000 (UTC) X-FDA: 79941193080.12.6841670 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) by imf16.hostedemail.com (Postfix) with ESMTP id 334D2180089 for ; Thu, 22 Sep 2022 22:41:00 +0000 (UTC) Received: by mail-pg1-f202.google.com with SMTP id e187-20020a6369c4000000b0041c8dfb8447so6071784pgc.23 for ; Thu, 22 Sep 2022 15:40:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date; bh=o0zQBmgFOza7kGjnXBSwwcCy6SGdp6sM7N1TFRG3PAs=; b=IAbpL3I6bFhgWp4WoWXjKEhylQg/NyflO9xv12+C+duSnFP9Q49DGSQqCROSlIM3Yz eHHlnrsHEiYHn2UE3sd4FJf6UD+RkhlpxjEpTxDxIVWGUJS4LiUKA0JYYAN64M+6CZmO /zP5mKP2qR4Fwekx/WDjSvK2Eu+FtyUhYzC5qUaj8wy6qqv4m4tqb64/KXDCnUnZHtP2 JGCRbmbio5LpowjEHqJZ+1Fk4sMu546VfXHfdVpXA4MaTKhLN1XK0ne49WCElli9SnYF eb8wSHEiLOkIaUc6GO7hNAqf9kCgfGo5asUDVkEiASSrEn0f3UAwIba2VxT5DWpPj4JR NOjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date; bh=o0zQBmgFOza7kGjnXBSwwcCy6SGdp6sM7N1TFRG3PAs=; b=PdFe8htutysn1izCF3b/XVSETAWQoiPFl2sEeubHGCp6zPVGwDsfYubakK4D4GMxYx mL2wdOybMElQT4ZdXNKfRWrdldpsDK+XyTtxg3kiSwJO2yttBgi78vBq/n9FCwVD/e9Q jziuoqXrona3ggFePDmpb+daG5C9hatE2kzTTPNtLShA26WMmm42g/WqUeOBuXXaA7qp 03+0iSwPedKZaddig/zGttTqtK52N2c7wCo4I/kGXVSbDjobAqjii/7CfuZ3IVx12bQx lwXhXqjJbNaM1kKEy+suMlNHetX+8PQoAof8Mb4JSro2X7Xes8d88bBX2xnAEwMVpHGk 8JMg== X-Gm-Message-State: ACrzQf1H6cqM8DT3rokSjEQoMT+Zi+5dvwwhnu+BjsaF3u7inmGSETQr lMSGobRLQ26tkfkoMODxpqPXHyh5tjqa X-Google-Smtp-Source: AMsMyM7hVpAJXf5Wkr7NvfavBwXBUzA/RbeJ0pmMced52nheubJfNMU3f1yDh4uRYuNUKAEoVeQ6l26EV/1k X-Received: from zokeefe3.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1b6]) (user=zokeefe job=sendgmr) by 2002:a05:6a02:28b:b0:439:19d6:fad5 with SMTP id bk11-20020a056a02028b00b0043919d6fad5mr5102840pgb.591.1663886459297; Thu, 22 Sep 2022 15:40:59 -0700 (PDT) Date: Thu, 22 Sep 2022 15:40:42 -0700 In-Reply-To: <20220922224046.1143204-1-zokeefe@google.com> Mime-Version: 1.0 References: <20220922224046.1143204-1-zokeefe@google.com> X-Mailer: git-send-email 2.37.3.998.g577e59143f-goog Message-ID: <20220922224046.1143204-7-zokeefe@google.com> Subject: [PATCH mm-unstable v4 06/10] selftests/vm: modularize thp collapse memory operations From: "Zach O'Keefe" To: Andrew Morton Cc: linux-mm@kvack.org, linux-api@vger.kernel.org, Axel Rasmussen , James Houghton , Hugh Dickins , Yang Shi , Miaohe Lin , David Hildenbrand , David Rientjes , Matthew Wilcox , Pasha Tatashin , Peter Xu , Rongwei Wang , SeongJae Park , Song Liu , Vlastimil Babka , Chris Kennelly , "Kirill A. Shutemov" , Minchan Kim , Patrick Xia ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1663886460; 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-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=o0zQBmgFOza7kGjnXBSwwcCy6SGdp6sM7N1TFRG3PAs=; b=VfgAtS7GmtBWlXlf1jugz4qMDRjSxQhBfMcIN0+9ClQpWgYOiDjVbrSvNPMKk7wn6utFnT Ndn2XQu5WiiByOJgCcx2ctUbMDhzuu6MPnEBrgHckxbXFQdYKREvoPVSMrYhmSM1pnysD+ Gb31XKUMIljdtbHYw1KhCq2ei53lAeM= ARC-Authentication-Results: i=1; imf16.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=IAbpL3I6; spf=pass (imf16.hostedemail.com: domain of 3e-QsYwcKCBgNC822324CC492.0CA96BIL-AA8Jy08.CF4@flex--zokeefe.bounces.google.com designates 209.85.215.202 as permitted sender) smtp.mailfrom=3e-QsYwcKCBgNC822324CC492.0CA96BIL-AA8Jy08.CF4@flex--zokeefe.bounces.google.com; dmarc=pass (policy=reject) header.from=google.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1663886460; a=rsa-sha256; cv=none; b=rbPkXYfs+0ov40qDX0NPGR/XDJVxucWW9qHiv8VIJg8htGdiEKvfjZMyWyxLaJv/7Zehwa ZPfYBHpXPB5FszPHrpU8tBIT5TviMo08flFedUTfZMmrLd0xq05aiwzH2fBAruNpdjqN2V +XUSByWwUnNuQAKxa7XwYb42B/yVVGU= X-Stat-Signature: 7mm35t7r1aufkfe1cs5szgmspc7h6txk X-Rspamd-Queue-Id: 334D2180089 X-Rspam-User: Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=IAbpL3I6; spf=pass (imf16.hostedemail.com: domain of 3e-QsYwcKCBgNC822324CC492.0CA96BIL-AA8Jy08.CF4@flex--zokeefe.bounces.google.com designates 209.85.215.202 as permitted sender) smtp.mailfrom=3e-QsYwcKCBgNC822324CC492.0CA96BIL-AA8Jy08.CF4@flex--zokeefe.bounces.google.com; dmarc=pass (policy=reject) header.from=google.com X-Rspamd-Server: rspam03 X-HE-Tag: 1663886460-24092 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: Modularize operations to setup, cleanup, fault, and check for huge pages, for a given memory type. This allows reusing existing tests with additional memory types by defining new memory operations. Following patches will add file and shmem memory types. Link: https://lkml.kernel.org/r/20220907144521.3115321-7-zokeefe@google.com Signed-off-by: Zach O'Keefe Cc: Axel Rasmussen Cc: Chris Kennelly Cc: David Hildenbrand Cc: David Rientjes Cc: Hugh Dickins Cc: James Houghton Cc: "Kirill A. Shutemov" Cc: Matthew Wilcox Cc: Miaohe Lin Cc: Minchan Kim Cc: Pasha Tatashin Cc: Peter Xu Cc: Rongwei Wang Cc: SeongJae Park Cc: Song Liu Cc: Vlastimil Babka Cc: Yang Shi --- tools/testing/selftests/vm/khugepaged.c | 373 +++++++++++++----------- 1 file changed, 207 insertions(+), 166 deletions(-) diff --git a/tools/testing/selftests/vm/khugepaged.c b/tools/testing/selftests/vm/khugepaged.c index 235a64b4458c..06ea6f18980e 100644 --- a/tools/testing/selftests/vm/khugepaged.c +++ b/tools/testing/selftests/vm/khugepaged.c @@ -29,8 +29,16 @@ static int hpage_pmd_nr; #define THP_SYSFS "/sys/kernel/mm/transparent_hugepage/" #define PID_SMAPS "/proc/self/smaps" +struct mem_ops { + void *(*setup_area)(int nr_hpages); + void (*cleanup_area)(void *p, unsigned long size); + void (*fault)(void *p, unsigned long start, unsigned long end); + bool (*check_huge)(void *addr, int nr_hpages); +}; + struct collapse_context { - void (*collapse)(const char *msg, char *p, int nr_hpages, bool expect); + void (*collapse)(const char *msg, char *p, int nr_hpages, + struct mem_ops *ops, bool expect); bool enforce_pte_scan_limits; }; @@ -354,11 +362,6 @@ static void save_settings(void) signal(SIGQUIT, restore_settings); } -static bool check_huge(void *addr, int nr_hpages) -{ - return check_huge_anon(addr, nr_hpages, hpage_pmd_size); -} - #define MAX_LINE_LENGTH 500 static bool check_swap(void *addr, unsigned long size) { @@ -452,18 +455,33 @@ static int madvise_collapse_retry(void *p, unsigned long size) * Returns pmd-mapped hugepage in VMA marked VM_HUGEPAGE, filled with * validate_memory()'able contents. */ -static void *alloc_hpage(void) +static void *alloc_hpage(struct mem_ops *ops) { - void *p; + void *p = ops->setup_area(1); - p = alloc_mapping(1); + ops->fault(p, 0, hpage_pmd_size); + + /* + * VMA should be neither VM_HUGEPAGE nor VM_NOHUGEPAGE. + * The latter is ineligible for collapse by MADV_COLLAPSE + * while the former might cause MADV_COLLAPSE to race with + * khugepaged on low-load system (like a test machine), which + * would cause MADV_COLLAPSE to fail with EAGAIN. + */ printf("Allocate huge page..."); - madvise(p, hpage_pmd_size, MADV_HUGEPAGE); - fill_memory(p, 0, hpage_pmd_size); - if (check_huge(p, 1)) - success("OK"); - else - fail("Fail"); + if (madvise_collapse_retry(p, hpage_pmd_size)) { + perror("madvise(MADV_COLLAPSE)"); + exit(EXIT_FAILURE); + } + if (!ops->check_huge(p, 1)) { + perror("madvise(MADV_COLLAPSE)"); + exit(EXIT_FAILURE); + } + if (madvise(p, hpage_pmd_size, MADV_HUGEPAGE)) { + perror("madvise(MADV_HUGEPAGE)"); + exit(EXIT_FAILURE); + } + success("OK"); return p; } @@ -480,18 +498,40 @@ static void validate_memory(int *p, unsigned long start, unsigned long end) } } -static void madvise_collapse(const char *msg, char *p, int nr_hpages, - bool expect) +static void *anon_setup_area(int nr_hpages) +{ + return alloc_mapping(nr_hpages); +} + +static void anon_cleanup_area(void *p, unsigned long size) +{ + munmap(p, size); +} + +static void anon_fault(void *p, unsigned long start, unsigned long end) +{ + fill_memory(p, start, end); +} + +static bool anon_check_huge(void *addr, int nr_hpages) +{ + return check_huge_anon(addr, nr_hpages, hpage_pmd_size); +} + +static struct mem_ops anon_ops = { + .setup_area = &anon_setup_area, + .cleanup_area = &anon_cleanup_area, + .fault = &anon_fault, + .check_huge = &anon_check_huge, +}; + +static void __madvise_collapse(const char *msg, char *p, int nr_hpages, + struct mem_ops *ops, bool expect) { int ret; struct settings settings = *current_settings(); printf("%s...", msg); - /* Sanity check */ - if (!check_huge(p, 0)) { - printf("Unexpected huge page\n"); - exit(EXIT_FAILURE); - } /* * Prevent khugepaged interference and tests that MADV_COLLAPSE @@ -505,7 +545,7 @@ static void madvise_collapse(const char *msg, char *p, int nr_hpages, ret = madvise_collapse_retry(p, nr_hpages * hpage_pmd_size); if (((bool)ret) == expect) fail("Fail: Bad return value"); - else if (check_huge(p, nr_hpages) != expect) + else if (!ops->check_huge(p, expect ? nr_hpages : 0)) fail("Fail: check_huge()"); else success("OK"); @@ -513,14 +553,26 @@ static void madvise_collapse(const char *msg, char *p, int nr_hpages, pop_settings(); } +static void madvise_collapse(const char *msg, char *p, int nr_hpages, + struct mem_ops *ops, bool expect) +{ + /* Sanity check */ + if (!ops->check_huge(p, 0)) { + printf("Unexpected huge page\n"); + exit(EXIT_FAILURE); + } + __madvise_collapse(msg, p, nr_hpages, ops, expect); +} + #define TICK 500000 -static bool wait_for_scan(const char *msg, char *p, int nr_hpages) +static bool wait_for_scan(const char *msg, char *p, int nr_hpages, + struct mem_ops *ops) { int full_scans; int timeout = 6; /* 3 seconds */ /* Sanity check */ - if (!check_huge(p, 0)) { + if (!ops->check_huge(p, 0)) { printf("Unexpected huge page\n"); exit(EXIT_FAILURE); } @@ -532,7 +584,7 @@ static bool wait_for_scan(const char *msg, char *p, int nr_hpages) printf("%s...", msg); while (timeout--) { - if (check_huge(p, nr_hpages)) + if (ops->check_huge(p, nr_hpages)) break; if (read_num("khugepaged/full_scans") >= full_scans) break; @@ -546,19 +598,20 @@ static bool wait_for_scan(const char *msg, char *p, int nr_hpages) } static void khugepaged_collapse(const char *msg, char *p, int nr_hpages, - bool expect) + struct mem_ops *ops, bool expect) { - if (wait_for_scan(msg, p, nr_hpages)) { + if (wait_for_scan(msg, p, nr_hpages, ops)) { if (expect) fail("Timeout"); else success("OK"); return; - } else if (check_huge(p, nr_hpages) == expect) { + } + + if (ops->check_huge(p, expect ? nr_hpages : 0)) success("OK"); - } else { + else fail("Fail"); - } } static void alloc_at_fault(void) @@ -572,7 +625,7 @@ static void alloc_at_fault(void) p = alloc_mapping(1); *p = 1; printf("Allocate huge page on fault..."); - if (check_huge(p, 1)) + if (check_huge_anon(p, 1, hpage_pmd_size)) success("OK"); else fail("Fail"); @@ -581,49 +634,48 @@ static void alloc_at_fault(void) madvise(p, page_size, MADV_DONTNEED); printf("Split huge PMD on MADV_DONTNEED..."); - if (check_huge(p, 0)) + if (check_huge_anon(p, 0, hpage_pmd_size)) success("OK"); else fail("Fail"); munmap(p, hpage_pmd_size); } -static void collapse_full(struct collapse_context *c) +static void collapse_full(struct collapse_context *c, struct mem_ops *ops) { void *p; int nr_hpages = 4; unsigned long size = nr_hpages * hpage_pmd_size; - p = alloc_mapping(nr_hpages); - fill_memory(p, 0, size); + p = ops->setup_area(nr_hpages); + ops->fault(p, 0, size); c->collapse("Collapse multiple fully populated PTE table", p, nr_hpages, - true); + ops, true); validate_memory(p, 0, size); - munmap(p, size); + ops->cleanup_area(p, size); } -static void collapse_empty(struct collapse_context *c) +static void collapse_empty(struct collapse_context *c, struct mem_ops *ops) { void *p; - p = alloc_mapping(1); - c->collapse("Do not collapse empty PTE table", p, 1, false); - munmap(p, hpage_pmd_size); + p = ops->setup_area(1); + c->collapse("Do not collapse empty PTE table", p, 1, ops, false); + ops->cleanup_area(p, hpage_pmd_size); } -static void collapse_single_pte_entry(struct collapse_context *c) +static void collapse_single_pte_entry(struct collapse_context *c, struct mem_ops *ops) { void *p; - p = alloc_mapping(1); - fill_memory(p, 0, page_size); + p = ops->setup_area(1); + ops->fault(p, 0, page_size); c->collapse("Collapse PTE table with single PTE entry present", p, - 1, true); - validate_memory(p, 0, page_size); - munmap(p, hpage_pmd_size); + 1, ops, true); + ops->cleanup_area(p, hpage_pmd_size); } -static void collapse_max_ptes_none(struct collapse_context *c) +static void collapse_max_ptes_none(struct collapse_context *c, struct mem_ops *ops) { int max_ptes_none = hpage_pmd_nr / 2; struct settings settings = *current_settings(); @@ -632,30 +684,30 @@ static void collapse_max_ptes_none(struct collapse_context *c) settings.khugepaged.max_ptes_none = max_ptes_none; push_settings(&settings); - p = alloc_mapping(1); + p = ops->setup_area(1); - fill_memory(p, 0, (hpage_pmd_nr - max_ptes_none - 1) * page_size); + ops->fault(p, 0, (hpage_pmd_nr - max_ptes_none - 1) * page_size); c->collapse("Maybe collapse with max_ptes_none exceeded", p, 1, - !c->enforce_pte_scan_limits); + ops, !c->enforce_pte_scan_limits); validate_memory(p, 0, (hpage_pmd_nr - max_ptes_none - 1) * page_size); if (c->enforce_pte_scan_limits) { - fill_memory(p, 0, (hpage_pmd_nr - max_ptes_none) * page_size); - c->collapse("Collapse with max_ptes_none PTEs empty", p, 1, + ops->fault(p, 0, (hpage_pmd_nr - max_ptes_none) * page_size); + c->collapse("Collapse with max_ptes_none PTEs empty", p, 1, ops, true); validate_memory(p, 0, (hpage_pmd_nr - max_ptes_none) * page_size); } - - munmap(p, hpage_pmd_size); + ops->cleanup_area(p, hpage_pmd_size); pop_settings(); } -static void collapse_swapin_single_pte(struct collapse_context *c) +static void collapse_swapin_single_pte(struct collapse_context *c, struct mem_ops *ops) { void *p; - p = alloc_mapping(1); - fill_memory(p, 0, hpage_pmd_size); + + p = ops->setup_area(1); + ops->fault(p, 0, hpage_pmd_size); printf("Swapout one page..."); if (madvise(p, page_size, MADV_PAGEOUT)) { @@ -669,20 +721,21 @@ static void collapse_swapin_single_pte(struct collapse_context *c) goto out; } - c->collapse("Collapse with swapping in single PTE entry", p, 1, true); + c->collapse("Collapse with swapping in single PTE entry", p, 1, ops, + true); validate_memory(p, 0, hpage_pmd_size); out: - munmap(p, hpage_pmd_size); + ops->cleanup_area(p, hpage_pmd_size); } -static void collapse_max_ptes_swap(struct collapse_context *c) +static void collapse_max_ptes_swap(struct collapse_context *c, struct mem_ops *ops) { int max_ptes_swap = read_num("khugepaged/max_ptes_swap"); void *p; - p = alloc_mapping(1); + p = ops->setup_area(1); + ops->fault(p, 0, hpage_pmd_size); - fill_memory(p, 0, hpage_pmd_size); printf("Swapout %d of %d pages...", max_ptes_swap + 1, hpage_pmd_nr); if (madvise(p, (max_ptes_swap + 1) * page_size, MADV_PAGEOUT)) { perror("madvise(MADV_PAGEOUT)"); @@ -695,12 +748,12 @@ static void collapse_max_ptes_swap(struct collapse_context *c) goto out; } - c->collapse("Maybe collapse with max_ptes_swap exceeded", p, 1, + c->collapse("Maybe collapse with max_ptes_swap exceeded", p, 1, ops, !c->enforce_pte_scan_limits); validate_memory(p, 0, hpage_pmd_size); if (c->enforce_pte_scan_limits) { - fill_memory(p, 0, hpage_pmd_size); + ops->fault(p, 0, hpage_pmd_size); printf("Swapout %d of %d pages...", max_ptes_swap, hpage_pmd_nr); if (madvise(p, max_ptes_swap * page_size, MADV_PAGEOUT)) { @@ -715,63 +768,65 @@ static void collapse_max_ptes_swap(struct collapse_context *c) } c->collapse("Collapse with max_ptes_swap pages swapped out", p, - 1, true); + 1, ops, true); validate_memory(p, 0, hpage_pmd_size); } out: - munmap(p, hpage_pmd_size); + ops->cleanup_area(p, hpage_pmd_size); } -static void collapse_single_pte_entry_compound(struct collapse_context *c) +static void collapse_single_pte_entry_compound(struct collapse_context *c, struct mem_ops *ops) { void *p; - p = alloc_hpage(); + p = alloc_hpage(ops); + madvise(p, hpage_pmd_size, MADV_NOHUGEPAGE); printf("Split huge page leaving single PTE mapping compound page..."); madvise(p + page_size, hpage_pmd_size - page_size, MADV_DONTNEED); - if (check_huge(p, 0)) + if (ops->check_huge(p, 0)) success("OK"); else fail("Fail"); c->collapse("Collapse PTE table with single PTE mapping compound page", - p, 1, true); + p, 1, ops, true); validate_memory(p, 0, page_size); - munmap(p, hpage_pmd_size); + ops->cleanup_area(p, hpage_pmd_size); } -static void collapse_full_of_compound(struct collapse_context *c) +static void collapse_full_of_compound(struct collapse_context *c, struct mem_ops *ops) { void *p; - p = alloc_hpage(); + p = alloc_hpage(ops); printf("Split huge page leaving single PTE page table full of compound pages..."); madvise(p, page_size, MADV_NOHUGEPAGE); madvise(p, hpage_pmd_size, MADV_NOHUGEPAGE); - if (check_huge(p, 0)) + if (ops->check_huge(p, 0)) success("OK"); else fail("Fail"); - c->collapse("Collapse PTE table full of compound pages", p, 1, true); + c->collapse("Collapse PTE table full of compound pages", p, 1, ops, + true); validate_memory(p, 0, hpage_pmd_size); - munmap(p, hpage_pmd_size); + ops->cleanup_area(p, hpage_pmd_size); } -static void collapse_compound_extreme(struct collapse_context *c) +static void collapse_compound_extreme(struct collapse_context *c, struct mem_ops *ops) { void *p; int i; - p = alloc_mapping(1); + p = ops->setup_area(1); for (i = 0; i < hpage_pmd_nr; i++) { printf("\rConstruct PTE page table full of different PTE-mapped compound pages %3d/%d...", i + 1, hpage_pmd_nr); madvise(BASE_ADDR, hpage_pmd_size, MADV_HUGEPAGE); - fill_memory(BASE_ADDR, 0, hpage_pmd_size); - if (!check_huge(BASE_ADDR, 1)) { + ops->fault(BASE_ADDR, 0, hpage_pmd_size); + if (!ops->check_huge(BASE_ADDR, 1)) { printf("Failed to allocate huge page\n"); exit(EXIT_FAILURE); } @@ -798,30 +853,30 @@ static void collapse_compound_extreme(struct collapse_context *c) } } - munmap(BASE_ADDR, hpage_pmd_size); - fill_memory(p, 0, hpage_pmd_size); - if (check_huge(p, 0)) + ops->cleanup_area(BASE_ADDR, hpage_pmd_size); + ops->fault(p, 0, hpage_pmd_size); + if (!ops->check_huge(p, 1)) success("OK"); else fail("Fail"); c->collapse("Collapse PTE table full of different compound pages", p, 1, - true); + ops, true); validate_memory(p, 0, hpage_pmd_size); - munmap(p, hpage_pmd_size); + ops->cleanup_area(p, hpage_pmd_size); } -static void collapse_fork(struct collapse_context *c) +static void collapse_fork(struct collapse_context *c, struct mem_ops *ops) { int wstatus; void *p; - p = alloc_mapping(1); + p = ops->setup_area(1); printf("Allocate small page..."); - fill_memory(p, 0, page_size); - if (check_huge(p, 0)) + ops->fault(p, 0, page_size); + if (ops->check_huge(p, 0)) success("OK"); else fail("Fail"); @@ -832,17 +887,17 @@ static void collapse_fork(struct collapse_context *c) skip_settings_restore = true; exit_status = 0; - if (check_huge(p, 0)) + if (ops->check_huge(p, 0)) success("OK"); else fail("Fail"); - fill_memory(p, page_size, 2 * page_size); + ops->fault(p, page_size, 2 * page_size); c->collapse("Collapse PTE table with single page shared with parent process", - p, 1, true); + p, 1, ops, true); validate_memory(p, 0, page_size); - munmap(p, hpage_pmd_size); + ops->cleanup_area(p, hpage_pmd_size); exit(exit_status); } @@ -850,27 +905,27 @@ static void collapse_fork(struct collapse_context *c) exit_status += WEXITSTATUS(wstatus); printf("Check if parent still has small page..."); - if (check_huge(p, 0)) + if (ops->check_huge(p, 0)) success("OK"); else fail("Fail"); validate_memory(p, 0, page_size); - munmap(p, hpage_pmd_size); + ops->cleanup_area(p, hpage_pmd_size); } -static void collapse_fork_compound(struct collapse_context *c) +static void collapse_fork_compound(struct collapse_context *c, struct mem_ops *ops) { int wstatus; void *p; - p = alloc_hpage(); + p = alloc_hpage(ops); printf("Share huge page over fork()..."); if (!fork()) { /* Do not touch settings on child exit */ skip_settings_restore = true; exit_status = 0; - if (check_huge(p, 1)) + if (ops->check_huge(p, 1)) success("OK"); else fail("Fail"); @@ -878,20 +933,20 @@ static void collapse_fork_compound(struct collapse_context *c) printf("Split huge page PMD in child process..."); madvise(p, page_size, MADV_NOHUGEPAGE); madvise(p, hpage_pmd_size, MADV_NOHUGEPAGE); - if (check_huge(p, 0)) + if (ops->check_huge(p, 0)) success("OK"); else fail("Fail"); - fill_memory(p, 0, page_size); + ops->fault(p, 0, page_size); write_num("khugepaged/max_ptes_shared", hpage_pmd_nr - 1); c->collapse("Collapse PTE table full of compound pages in child", - p, 1, true); + p, 1, ops, true); write_num("khugepaged/max_ptes_shared", current_settings()->khugepaged.max_ptes_shared); validate_memory(p, 0, hpage_pmd_size); - munmap(p, hpage_pmd_size); + ops->cleanup_area(p, hpage_pmd_size); exit(exit_status); } @@ -899,59 +954,59 @@ static void collapse_fork_compound(struct collapse_context *c) exit_status += WEXITSTATUS(wstatus); printf("Check if parent still has huge page..."); - if (check_huge(p, 1)) + if (ops->check_huge(p, 1)) success("OK"); else fail("Fail"); validate_memory(p, 0, hpage_pmd_size); - munmap(p, hpage_pmd_size); + ops->cleanup_area(p, hpage_pmd_size); } -static void collapse_max_ptes_shared(struct collapse_context *c) +static void collapse_max_ptes_shared(struct collapse_context *c, struct mem_ops *ops) { int max_ptes_shared = read_num("khugepaged/max_ptes_shared"); int wstatus; void *p; - p = alloc_hpage(); + p = alloc_hpage(ops); printf("Share huge page over fork()..."); if (!fork()) { /* Do not touch settings on child exit */ skip_settings_restore = true; exit_status = 0; - if (check_huge(p, 1)) + if (ops->check_huge(p, 1)) success("OK"); else fail("Fail"); printf("Trigger CoW on page %d of %d...", hpage_pmd_nr - max_ptes_shared - 1, hpage_pmd_nr); - fill_memory(p, 0, (hpage_pmd_nr - max_ptes_shared - 1) * page_size); - if (check_huge(p, 0)) + ops->fault(p, 0, (hpage_pmd_nr - max_ptes_shared - 1) * page_size); + if (ops->check_huge(p, 0)) success("OK"); else fail("Fail"); c->collapse("Maybe collapse with max_ptes_shared exceeded", p, - 1, !c->enforce_pte_scan_limits); + 1, ops, !c->enforce_pte_scan_limits); if (c->enforce_pte_scan_limits) { printf("Trigger CoW on page %d of %d...", hpage_pmd_nr - max_ptes_shared, hpage_pmd_nr); - fill_memory(p, 0, (hpage_pmd_nr - max_ptes_shared) * + ops->fault(p, 0, (hpage_pmd_nr - max_ptes_shared) * page_size); - if (check_huge(p, 0)) + if (ops->check_huge(p, 0)) success("OK"); else fail("Fail"); c->collapse("Collapse with max_ptes_shared PTEs shared", - p, 1, true); + p, 1, ops, true); } validate_memory(p, 0, hpage_pmd_size); - munmap(p, hpage_pmd_size); + ops->cleanup_area(p, hpage_pmd_size); exit(exit_status); } @@ -959,42 +1014,28 @@ static void collapse_max_ptes_shared(struct collapse_context *c) exit_status += WEXITSTATUS(wstatus); printf("Check if parent still has huge page..."); - if (check_huge(p, 1)) + if (ops->check_huge(p, 1)) success("OK"); else fail("Fail"); validate_memory(p, 0, hpage_pmd_size); - munmap(p, hpage_pmd_size); + ops->cleanup_area(p, hpage_pmd_size); } -static void madvise_collapse_existing_thps(void) +static void madvise_collapse_existing_thps(struct collapse_context *c, + struct mem_ops *ops) { void *p; - int err; - p = alloc_mapping(1); - fill_memory(p, 0, hpage_pmd_size); + p = ops->setup_area(1); + ops->fault(p, 0, hpage_pmd_size); + c->collapse("Collapse fully populated PTE table...", p, 1, ops, true); + validate_memory(p, 0, hpage_pmd_size); - printf("Collapse fully populated PTE table..."); - /* - * Note that we don't set MADV_HUGEPAGE here, which - * also tests that VM_HUGEPAGE isn't required for - * MADV_COLLAPSE in "madvise" mode. - */ - err = madvise(p, hpage_pmd_size, MADV_COLLAPSE); - if (err == 0 && check_huge(p, 1)) { - success("OK"); - printf("Re-collapse PMD-mapped hugepage"); - err = madvise(p, hpage_pmd_size, MADV_COLLAPSE); - if (err == 0 && check_huge(p, 1)) - success("OK"); - else - fail("Fail"); - } else { - fail("Fail"); - } + /* c->collapse() will find a hugepage and complain - call directly. */ + __madvise_collapse("Re-collapse PMD-mapped hugepage", p, 1, ops, true); validate_memory(p, 0, hpage_pmd_size); - munmap(p, hpage_pmd_size); + ops->cleanup_area(p, hpage_pmd_size); } int main(int argc, const char **argv) @@ -1034,37 +1075,37 @@ int main(int argc, const char **argv) c.collapse = &khugepaged_collapse; c.enforce_pte_scan_limits = true; - collapse_full(&c); - collapse_empty(&c); - collapse_single_pte_entry(&c); - collapse_max_ptes_none(&c); - collapse_swapin_single_pte(&c); - collapse_max_ptes_swap(&c); - collapse_single_pte_entry_compound(&c); - collapse_full_of_compound(&c); - collapse_compound_extreme(&c); - collapse_fork(&c); - collapse_fork_compound(&c); - collapse_max_ptes_shared(&c); + collapse_full(&c, &anon_ops); + collapse_empty(&c, &anon_ops); + collapse_single_pte_entry(&c, &anon_ops); + collapse_max_ptes_none(&c, &anon_ops); + collapse_swapin_single_pte(&c, &anon_ops); + collapse_max_ptes_swap(&c, &anon_ops); + collapse_single_pte_entry_compound(&c, &anon_ops); + collapse_full_of_compound(&c, &anon_ops); + collapse_compound_extreme(&c, &anon_ops); + collapse_fork(&c, &anon_ops); + collapse_fork_compound(&c, &anon_ops); + collapse_max_ptes_shared(&c, &anon_ops); } if (!strcmp(tests, "madvise") || !strcmp(tests, "all")) { printf("\n*** Testing context: madvise ***\n"); c.collapse = &madvise_collapse; c.enforce_pte_scan_limits = false; - collapse_full(&c); - collapse_empty(&c); - collapse_single_pte_entry(&c); - collapse_max_ptes_none(&c); - collapse_swapin_single_pte(&c); - collapse_max_ptes_swap(&c); - collapse_single_pte_entry_compound(&c); - collapse_full_of_compound(&c); - collapse_compound_extreme(&c); - collapse_fork(&c); - collapse_fork_compound(&c); - collapse_max_ptes_shared(&c); - madvise_collapse_existing_thps(); + collapse_full(&c, &anon_ops); + collapse_empty(&c, &anon_ops); + collapse_single_pte_entry(&c, &anon_ops); + collapse_max_ptes_none(&c, &anon_ops); + collapse_swapin_single_pte(&c, &anon_ops); + collapse_max_ptes_swap(&c, &anon_ops); + collapse_single_pte_entry_compound(&c, &anon_ops); + collapse_full_of_compound(&c, &anon_ops); + collapse_compound_extreme(&c, &anon_ops); + collapse_fork(&c, &anon_ops); + collapse_fork_compound(&c, &anon_ops); + collapse_max_ptes_shared(&c, &anon_ops); + madvise_collapse_existing_thps(&c, &anon_ops); } restore_settings(0);