From patchwork Thu Sep 22 22:40:41 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: 12985908 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 35FC7C54EE9 for ; Thu, 22 Sep 2022 22:41:00 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 78DC694000D; Thu, 22 Sep 2022 18:40:59 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 69E98940007; Thu, 22 Sep 2022 18:40:59 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4CA7994000D; Thu, 22 Sep 2022 18:40:59 -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 3C07A940007 for ; Thu, 22 Sep 2022 18:40:59 -0400 (EDT) Received: from smtpin18.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 1E449A0B54 for ; Thu, 22 Sep 2022 22:40:59 +0000 (UTC) X-FDA: 79941193038.18.F6D01AE Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) by imf05.hostedemail.com (Postfix) with ESMTP id AAC79100003 for ; Thu, 22 Sep 2022 22:40:58 +0000 (UTC) Received: by mail-pg1-f202.google.com with SMTP id a33-20020a630b61000000b00429d91cc649so5988918pgl.8 for ; Thu, 22 Sep 2022 15:40:58 -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=utuE6lqKBJIEKGH4+B+hune/6k6tZq0aWAJkqoURqk0=; b=UZ4msjJdD5WvKXwPxcVJIaPIrBENIQfCoqWiQ/JjJTsKjaJ0CK1UlAi/mFi01hCHbe V9AQfcAJNiCa8a1CBRSsWiE4dyxa3rkOE3AWzQRu4CyPlwnhL5Ujt0egLyGZPdeVEvpQ Lbxls3H/hQ+48g8cEu3KouCJLEJdNrQNWn8Ij9ZtvvLmOex2VKtuc8ZFec5ELmur/QM/ X0nltLtuoEqGHSK8qzHS6tHg0IvxxwSwMAcR0KBCCojJNZ/A8nPDiYibhZWCsxufnZJA IpIQOzLO4arKn99g4SrOlyPIyx0GMdVXn09A+qSbm0Qvyq1y4XnbWDk5ShZmCiepKRjD gF/A== 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=utuE6lqKBJIEKGH4+B+hune/6k6tZq0aWAJkqoURqk0=; b=CwOav7YA+RKsFAVcoT7wp8RUxKj+ToyktYC1ftqlhWFMw7W/GvbMWL5SFn5045/G7w 1ywSAKhAzpKm/KK66fRrxYyNWD4OmrZhGTylmjFtv/XZ8WniArF+neYfPBzIF9q0Hq4d 2hzKp+H0nrhBLsaGieRpEUXtmdC211+MRf0rW7IXNJDX4rm76sHouOq7EuXRrLAhaXH+ HBZzsyRWF2b1wN24giZVeU6/t+WrOcVcAzqf8xtGbl/NB4xBC438D+uppFbR9qvFyOud 5CuUqHKqY+uepVFvYvLlfD6H48qAmflRebZbyF9JOxH5Y7F6TidlF3VCykldi4VnixoL XqsQ== X-Gm-Message-State: ACrzQf3GYR5C6kc5Ukxc7uzJ45KluxQvm7iBsW36p4mYQv/U7gDHJFei l0QFRuosXZntl/w+z/bBqvue6UvifJMn X-Google-Smtp-Source: AMsMyM4oWLM6XB3Tm5pXduKo2eeYprCavqqw2mG3KiyUE0K8sQ4yuABPSq9UJdL+1QY9msR4x0MH7oqSJFiQ X-Received: from zokeefe3.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1b6]) (user=zokeefe job=sendgmr) by 2002:a17:902:d491:b0:178:2cc3:a4c6 with SMTP id c17-20020a170902d49100b001782cc3a4c6mr5592230plg.46.1663886457609; Thu, 22 Sep 2022 15:40:57 -0700 (PDT) Date: Thu, 22 Sep 2022 15:40:41 -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: <20220922224046.1143204-6-zokeefe@google.com> Subject: [PATCH mm-unstable v4 05/10] selftests/vm: dedup THP helpers 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-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1663886458; a=rsa-sha256; cv=none; b=EexRpTn6zQdutP94WF1ExbGceuHXfyr0lvsGk2q7TZ76Enbi/ywvxqEPHPFNC+NvMzLLIH AQTzLm9Wjp8Pm58oyFChnGNSKkrEBD+EDkVmE9A4HaoZkL0k6nISflKHibT/sE9IZAMnyn rjXJPhPWf5cPtl3fqSPUZjYSwZcBTCQ= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=UZ4msjJd; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf05.hostedemail.com: domain of 3eeQsYwcKCBYLA600102AA270.yA8749GJ-886Hwy6.AD2@flex--zokeefe.bounces.google.com designates 209.85.215.202 as permitted sender) smtp.mailfrom=3eeQsYwcKCBYLA600102AA270.yA8749GJ-886Hwy6.AD2@flex--zokeefe.bounces.google.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1663886458; 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=utuE6lqKBJIEKGH4+B+hune/6k6tZq0aWAJkqoURqk0=; b=R9r7LnlpM6o334DKawHiUhfIHq7IeReGnhAe8qBcJgOvoQbRCVcmmsZR8MKBKDAlHO6aTq G1dZbWDqL1r+iISV2D+JALBIQ+56Bzqvgj61j0lYegoox9Mzf0IBTz7rRfnj7fHRSplEK+ 0I6ki9uLcE8nOOHpdYXB7tPG4BDCrR8= X-Stat-Signature: ngxxj8ut9nk6sh7196cf58ahox5dcxmg X-Rspamd-Queue-Id: AAC79100003 Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=UZ4msjJd; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf05.hostedemail.com: domain of 3eeQsYwcKCBYLA600102AA270.yA8749GJ-886Hwy6.AD2@flex--zokeefe.bounces.google.com designates 209.85.215.202 as permitted sender) smtp.mailfrom=3eeQsYwcKCBYLA600102AA270.yA8749GJ-886Hwy6.AD2@flex--zokeefe.bounces.google.com X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1663886458-778918 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: These files: tools/testing/selftests/vm/vm_util.c tools/testing/selftests/vm/khugepaged.c Both contain logic to: 1) Determine hugepage size on current system 2) Read /proc/self/smaps to determine number of THPs at an address Refactor selftests/vm/khugepaged.c to use the vm_util common helpers and add it as a build dependency. Since selftests/vm/khugepaged.c is the largest user of check_huge(), change the signature of check_huge() to match selftests/vm/khugepaged.c's useage: take an expected number of hugepages, and return a bool indicating if the correct number of hugepages were found. Add a wrapper, check_huge_anon(), in anticipation of checking smaps for file and shmem hugepages. Update existing callsites to use the new pattern / function. Likewise, check_for_pattern() was duplicated, and it's a general enough helper to include in vm_util helpers as well. Link: https://lkml.kernel.org/r/20220907144521.3115321-6-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/Makefile | 1 + tools/testing/selftests/vm/khugepaged.c | 64 ++----------------- tools/testing/selftests/vm/soft-dirty.c | 2 +- .../selftests/vm/split_huge_page_test.c | 12 ++-- tools/testing/selftests/vm/vm_util.c | 26 +++++--- tools/testing/selftests/vm/vm_util.h | 3 +- 6 files changed, 32 insertions(+), 76 deletions(-) diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile index 6e66404e116f..824d3a58ab1a 100644 --- a/tools/testing/selftests/vm/Makefile +++ b/tools/testing/selftests/vm/Makefile @@ -95,6 +95,7 @@ TEST_FILES += va_128TBswitch.sh include ../lib.mk +$(OUTPUT)/khugepaged: vm_util.c $(OUTPUT)/madv_populate: vm_util.c $(OUTPUT)/soft-dirty: vm_util.c $(OUTPUT)/split_huge_page_test: vm_util.c diff --git a/tools/testing/selftests/vm/khugepaged.c b/tools/testing/selftests/vm/khugepaged.c index b55dc331af13..235a64b4458c 100644 --- a/tools/testing/selftests/vm/khugepaged.c +++ b/tools/testing/selftests/vm/khugepaged.c @@ -12,6 +12,8 @@ #include #include +#include "vm_util.h" + #ifndef MADV_PAGEOUT #define MADV_PAGEOUT 21 #endif @@ -352,64 +354,12 @@ static void save_settings(void) signal(SIGQUIT, restore_settings); } -#define MAX_LINE_LENGTH 500 - -static bool check_for_pattern(FILE *fp, char *pattern, char *buf) -{ - while (fgets(buf, MAX_LINE_LENGTH, fp) != NULL) { - if (!strncmp(buf, pattern, strlen(pattern))) - return true; - } - return false; -} - static bool check_huge(void *addr, int nr_hpages) { - bool thp = false; - int ret; - FILE *fp; - char buffer[MAX_LINE_LENGTH]; - char addr_pattern[MAX_LINE_LENGTH]; - - ret = snprintf(addr_pattern, MAX_LINE_LENGTH, "%08lx-", - (unsigned long) addr); - if (ret >= MAX_LINE_LENGTH) { - printf("%s: Pattern is too long\n", __func__); - exit(EXIT_FAILURE); - } - - - fp = fopen(PID_SMAPS, "r"); - if (!fp) { - printf("%s: Failed to open file %s\n", __func__, PID_SMAPS); - exit(EXIT_FAILURE); - } - if (!check_for_pattern(fp, addr_pattern, buffer)) - goto err_out; - - ret = snprintf(addr_pattern, MAX_LINE_LENGTH, "AnonHugePages:%10ld kB", - nr_hpages * (hpage_pmd_size >> 10)); - if (ret >= MAX_LINE_LENGTH) { - printf("%s: Pattern is too long\n", __func__); - exit(EXIT_FAILURE); - } - /* - * Fetch the AnonHugePages: in the same block and check whether it got - * the expected number of hugeepages next. - */ - if (!check_for_pattern(fp, "AnonHugePages:", buffer)) - goto err_out; - - if (strncmp(buffer, addr_pattern, strlen(addr_pattern))) - goto err_out; - - thp = true; -err_out: - fclose(fp); - return thp; + return check_huge_anon(addr, nr_hpages, hpage_pmd_size); } - +#define MAX_LINE_LENGTH 500 static bool check_swap(void *addr, unsigned long size) { bool swap = false; @@ -431,7 +381,7 @@ static bool check_swap(void *addr, unsigned long size) printf("%s: Failed to open file %s\n", __func__, PID_SMAPS); exit(EXIT_FAILURE); } - if (!check_for_pattern(fp, addr_pattern, buffer)) + if (!check_for_pattern(fp, addr_pattern, buffer, sizeof(buffer))) goto err_out; ret = snprintf(addr_pattern, MAX_LINE_LENGTH, "Swap:%19ld kB", @@ -444,7 +394,7 @@ static bool check_swap(void *addr, unsigned long size) * Fetch the Swap: in the same block and check whether it got * the expected number of hugeepages next. */ - if (!check_for_pattern(fp, "Swap:", buffer)) + if (!check_for_pattern(fp, "Swap:", buffer, sizeof(buffer))) goto err_out; if (strncmp(buffer, addr_pattern, strlen(addr_pattern))) @@ -1066,7 +1016,7 @@ int main(int argc, const char **argv) setbuf(stdout, NULL); page_size = getpagesize(); - hpage_pmd_size = read_num("hpage_pmd_size"); + hpage_pmd_size = read_pmd_pagesize(); hpage_pmd_nr = hpage_pmd_size / page_size; default_settings.khugepaged.max_ptes_none = hpage_pmd_nr - 1; diff --git a/tools/testing/selftests/vm/soft-dirty.c b/tools/testing/selftests/vm/soft-dirty.c index e3a43f5d4fa2..21d8830c5f24 100644 --- a/tools/testing/selftests/vm/soft-dirty.c +++ b/tools/testing/selftests/vm/soft-dirty.c @@ -91,7 +91,7 @@ static void test_hugepage(int pagemap_fd, int pagesize) for (i = 0; i < hpage_len; i++) map[i] = (char)i; - if (check_huge(map)) { + if (check_huge_anon(map, 1, hpage_len)) { ksft_test_result_pass("Test %s huge page allocation\n", __func__); clear_softdirty(); diff --git a/tools/testing/selftests/vm/split_huge_page_test.c b/tools/testing/selftests/vm/split_huge_page_test.c index 6aa2b8253aed..76e1c36dd9e5 100644 --- a/tools/testing/selftests/vm/split_huge_page_test.c +++ b/tools/testing/selftests/vm/split_huge_page_test.c @@ -92,7 +92,6 @@ void split_pmd_thp(void) { char *one_page; size_t len = 4 * pmd_pagesize; - uint64_t thp_size; size_t i; one_page = memalign(pmd_pagesize, len); @@ -107,8 +106,7 @@ void split_pmd_thp(void) for (i = 0; i < len; i++) one_page[i] = (char)i; - thp_size = check_huge(one_page); - if (!thp_size) { + if (!check_huge_anon(one_page, 1, pmd_pagesize)) { printf("No THP is allocated\n"); exit(EXIT_FAILURE); } @@ -124,9 +122,8 @@ void split_pmd_thp(void) } - thp_size = check_huge(one_page); - if (thp_size) { - printf("Still %ld kB AnonHugePages not split\n", thp_size); + if (check_huge_anon(one_page, 0, pmd_pagesize)) { + printf("Still AnonHugePages not split\n"); exit(EXIT_FAILURE); } @@ -172,8 +169,7 @@ void split_pte_mapped_thp(void) for (i = 0; i < len; i++) one_page[i] = (char)i; - thp_size = check_huge(one_page); - if (!thp_size) { + if (!check_huge_anon(one_page, 1, pmd_pagesize)) { printf("No THP is allocated\n"); exit(EXIT_FAILURE); } diff --git a/tools/testing/selftests/vm/vm_util.c b/tools/testing/selftests/vm/vm_util.c index 2768d4f3de4c..77244df973e9 100644 --- a/tools/testing/selftests/vm/vm_util.c +++ b/tools/testing/selftests/vm/vm_util.c @@ -64,9 +64,9 @@ void clear_softdirty(void) ksft_exit_fail_msg("writing clear_refs failed\n"); } -static bool check_for_pattern(FILE *fp, const char *pattern, char *buf) +bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len) { - while (fgets(buf, MAX_LINE_LENGTH, fp) != NULL) { + while (fgets(buf, len, fp)) { if (!strncmp(buf, pattern, strlen(pattern))) return true; } @@ -94,9 +94,10 @@ uint64_t read_pmd_pagesize(void) return strtoul(buf, NULL, 10); } -uint64_t check_huge(void *addr) +bool __check_huge(void *addr, char *pattern, int nr_hpages, + uint64_t hpage_size) { - uint64_t thp = 0; + uint64_t thp = -1; int ret; FILE *fp; char buffer[MAX_LINE_LENGTH]; @@ -111,20 +112,27 @@ uint64_t check_huge(void *addr) if (!fp) ksft_exit_fail_msg("%s: Failed to open file %s\n", __func__, SMAP_FILE_PATH); - if (!check_for_pattern(fp, addr_pattern, buffer)) + if (!check_for_pattern(fp, addr_pattern, buffer, sizeof(buffer))) goto err_out; /* - * Fetch the AnonHugePages: in the same block and check the number of + * Fetch the pattern in the same block and check the number of * hugepages. */ - if (!check_for_pattern(fp, "AnonHugePages:", buffer)) + if (!check_for_pattern(fp, pattern, buffer, sizeof(buffer))) goto err_out; - if (sscanf(buffer, "AnonHugePages:%10ld kB", &thp) != 1) + snprintf(addr_pattern, MAX_LINE_LENGTH, "%s%%9ld kB", pattern); + + if (sscanf(buffer, addr_pattern, &thp) != 1) ksft_exit_fail_msg("Reading smap error\n"); err_out: fclose(fp); - return thp; + return thp == (nr_hpages * (hpage_size >> 10)); +} + +bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size) +{ + return __check_huge(addr, "AnonHugePages: ", nr_hpages, hpage_size); } diff --git a/tools/testing/selftests/vm/vm_util.h b/tools/testing/selftests/vm/vm_util.h index 307e11f72341..65c8c561bebd 100644 --- a/tools/testing/selftests/vm/vm_util.h +++ b/tools/testing/selftests/vm/vm_util.h @@ -7,5 +7,6 @@ bool pagemap_is_softdirty(int fd, char *start); bool pagemap_is_swapped(int fd, char *start); bool pagemap_range_some_swapped(int fd, char *start, size_t len); void clear_softdirty(void); +bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len); uint64_t read_pmd_pagesize(void); -uint64_t check_huge(void *addr); +bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size);