linux-kernel - [V2 PATCH 5/6] KVM: selftests: Add get_free_huge_2m

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Message-ID: <20221205232341.4131240-6-vannapurve@google.com>
Date:   Mon,  5 Dec 2022 23:23:40 +0000
From:   Vishal Annapurve <vannapurve@...gle.com>
To:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Cc:     pbonzini@...hat.com, vkuznets@...hat.com, wanpengli@...cent.com,
        jmattson@...gle.com, joro@...tes.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, shuah@...nel.org, yang.zhong@...el.com,
        ricarkol@...gle.com, aaronlewis@...gle.com, wei.w.wang@...el.com,
        kirill.shutemov@...ux.intel.com, corbet@....net, hughd@...gle.com,
        jlayton@...nel.org, bfields@...ldses.org,
        akpm@...ux-foundation.org, chao.p.peng@...ux.intel.com,
        yu.c.zhang@...ux.intel.com, jun.nakajima@...el.com,
        dave.hansen@...el.com, michael.roth@....com, qperret@...gle.com,
        steven.price@....com, ak@...ux.intel.com, david@...hat.com,
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        dmatlack@...gle.com, axelrasmussen@...gle.com,
        maciej.szmigiero@...cle.com, mizhang@...gle.com,
        bgardon@...gle.com, ackerleytng@...gle.com,
        Vishal Annapurve <vannapurve@...gle.com>
Subject: [V2 PATCH 5/6] KVM: selftests: Add get_free_huge_2m_pages

Add an API to query free 2MB hugepages in the system.

Signed-off-by: Vishal Annapurve <vannapurve@...gle.com>
---
 .../testing/selftests/kvm/include/test_util.h  |  1 +
 tools/testing/selftests/kvm/lib/test_util.c    | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
index aea80071f2b8..3d1cc215940a 100644
--- a/tools/testing/selftests/kvm/include/test_util.h
+++ b/tools/testing/selftests/kvm/include/test_util.h
@@ -122,6 +122,7 @@ struct vm_mem_backing_src_alias {
 bool thp_configured(void);
 size_t get_trans_hugepagesz(void);
 size_t get_def_hugetlb_pagesz(void);
+size_t get_free_huge_2mb_pages(void);
 const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i);
 size_t get_backing_src_pagesz(uint32_t i);
 bool is_backing_src_hugetlb(uint32_t i);
diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c
index d33b98bfe8a3..745573023b57 100644
--- a/tools/testing/selftests/kvm/lib/test_util.c
+++ b/tools/testing/selftests/kvm/lib/test_util.c
@@ -162,6 +162,24 @@ size_t get_trans_hugepagesz(void)
 	return size;
 }
 
+size_t get_free_huge_2mb_pages(void)
+{
+	size_t free_pages;
+	FILE *f;
+	int ret;
+
+	f = fopen("/sys/kernel/mm/hugepages/hugepages-2048kB/free_hugepages", "r");
+	TEST_ASSERT(f != NULL, "Error in opening hugepages-2048kB/free_hugepages");
+
+	do {
+		ret = fscanf(f, "%ld", &free_pages);
+	} while (errno == EINTR);
+	TEST_ASSERT(ret < 1, "Error reading hugepages-2048kB/free_hugepages");
+	fclose(f);
+
+	return free_pages;
+}
+
 size_t get_def_hugetlb_pagesz(void)
 {
 	char buf[64];
-- 
2.39.0.rc0.267.gcb52ba06e7-goog