{"id":1297,"date":"2026-10-24T22:00:00","date_gmt":"2026-10-24T13:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1297"},"modified":"2026-10-24T23:36:45","modified_gmt":"2026-10-24T14:36:45","slug":"qs-madv-dontneed-next-access-content-20261023","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1297","title":{"rendered":"MADV_DONTNEED\u306f\u4f55\u3092\u6368\u3066\u308b\u306e\u304b\u3001\u6b21\u306e\u30a2\u30af\u30bb\u30b9\u3067\u623b\u308b\u5185\u5bb9\u3092\u5206\u3051\u308b"},"content":{"rendered":"<p>\u5927\u304d\u306a\u8a08\u7b97\u304c\u7d42\u308f\u308b\u3068\u3001\u9014\u4e2d\u3067\u4f7f\u3063\u305f\u30e1\u30e2\u30ea\u30fc\u304c\u4e0d\u8981\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3042\u3068\u3067\u540c\u3058\u30a2\u30c9\u30ec\u30b9\u3092\u4f7f\u3044\u305f\u3044\u306a\u3089\u3001\u9818\u57df\u306e\u5272\u308a\u5f53\u3066\u3092\u6b8b\u3057\u305f\u307e\u307e\u3001\u4e2d\u8eab\u3092\u624b\u653e\u3059\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002Linux\u3067\u306f\u3001madvise\u306bMADV_DONTNEED\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u3053\u306e\u3088\u3046\u306a\u4f7f\u3044\u65b9\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u5f8c\u306b\u8aad\u3081\u308b\u5024\u306f\u3001\u30e1\u30e2\u30ea\u30fc\u306e\u7a2e\u985e\u306b\u3088\u3063\u3066\u5909\u308f\u308a\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u306b\u7d50\u3073\u4ed8\u3044\u3066\u3044\u306a\u3044\u3001\u305d\u306e\u30d7\u30ed\u30bb\u30b9\u5c02\u7528\u306e\u9818\u57df\u3067\u306f\u30bc\u30ed\u57cb\u3081\u3055\u308c\u305f\u5185\u5bb9\u3092\u8aad\u307f\u307e\u3059\u3002\u4e00\u65b9\u3001\u5171\u6709\u30d5\u30a1\u30a4\u30eb\u306e\u9818\u57df\u3067\u306f\u3001\u5143\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u73fe\u5728\u306e\u5185\u5bb9\u3092\u8aad\u307f\u307e\u3059\u3002\u4ee5\u4e0b\u3067\u306f\u547c\u3073\u51fa\u3057\u304c\u6210\u529f\u3057\u3001\u30de\u30c3\u30d4\u30f3\u30b0\u3068\u8aad\u307f\u53d6\u308a\u6a29\u9650\u304c\u4fdd\u305f\u308c\u3001\u305d\u306e\u5f8c\u306b\u5225\u306e\u66f8\u304d\u8fbc\u307f\u304c\u306a\u3044\u5834\u5408\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<section 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TLB\u30da\u30fc\u30b8\u3067\u306f\u3001\u305d\u306e\u30da\u30fc\u30b8\u30b5\u30a4\u30ba\u306b\u5408\u308f\u305b\u3066\u958b\u59cb\u30a2\u30c9\u30ec\u30b9\u3092\u6574\u5217\u3057\u3001\u7bc4\u56f2\u306e\u9577\u3055\u3082\u305d\u306e\u500d\u6570\u3078\u5207\u308a\u4e0a\u3052\u307e\u3059\u3002\u901a\u5e38\u30da\u30fc\u30b8\u3068\u540c\u3058\u30b5\u30a4\u30ba\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002\u53c2\u7167\u3057\u305f\u30de\u30cb\u30e5\u30a2\u30eb\u3067\u306f\u3001MADV_DONTNEED\u306eHuge TLB\u5bfe\u5fdc\u306fLinux 5.18\u4ee5\u964d\u3067\u3059\u3002<\/p>\n<p>\u30ed\u30c3\u30af\u3055\u308c\u305f\u30da\u30fc\u30b8\u3084\u3001\u30ab\u30fc\u30cd\u30eb\u5185\u90e8\u3067VM_PFNMAP\u3068\u8a18\u3055\u308c\u305f\u7279\u6b8a\u9818\u57df\u306b\u306f\u9069\u7528\u3067\u304d\u307e\u305b\u3093\u3002\u5f8c\u8005\u306b\u306f\u3001\u30c7\u30d0\u30a4\u30b9\u30c9\u30e9\u30a4\u30d0\u30fc\u304c\u30e6\u30fc\u30b6\u30fc\u7a7a\u9593\u3078\u5272\u308a\u5f53\u3066\u308b\u3001\u901a\u5e38\u306e\u4eee\u60f3\u30e1\u30e2\u30ea\u30fc\u7ba1\u7406\u306e\u5bfe\u8c61\u3067\u306f\u306a\u3044\u9818\u57df\u306a\u3069\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>madvise\u306e\u623b\u308a\u5024\u306f\u6210\u529f\u6642\u306b0\u3001\u5931\u6557\u6642\u306b\u22121\u3067\u3001\u5931\u6557\u306e\u7406\u7531\u306ferrno\u306b\u8a2d\u5b9a\u3055\u308c\u307e\u3059\u3002\u547c\u3073\u51fa\u3057\u305f\u3060\u3051\u3067\u9818\u57df\u304c\u30ea\u30bb\u30c3\u30c8\u3055\u308c\u305f\u3068\u306f\u6271\u308f\u305a\u3001\u623b\u308a\u5024\u3092\u78ba\u8a8d\u3057\u3066\u5931\u6557\u3092\u51e6\u7406\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u8aac\u660e\u3057\u305f\u306e\u306fLinux\u306emadvise\u3067\u3059\u3002\u4f3c\u305f\u540d\u524d\u306ePOSIX\u306eposix_madvise\u3078\u3001\u5185\u5bb9\u304c\u5909\u308f\u308b\u3068\u3044\u3046\u52d5\u4f5c\u3092\u305d\u306e\u307e\u307e\u79fb\u3059\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u4f7f\u3044\u7d42\u3048\u305f\u4f5c\u696d\u9818\u57df\u3092\u624b\u653e\u3059\u3068\u304d\u306f\u3001\u6b21\u306b\u5fc5\u8981\u306a\u306e\u304c\u540c\u3058\u30a2\u30c9\u30ec\u30b9\u306a\u306e\u304b\u3001\u305d\u3053\u306b\u6b8b\u3057\u305f\u5024\u306a\u306e\u304b\u3092\u8003\u3048\u308b\u3068\u5224\u65ad\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u5024\u3092\u518d\u8a08\u7b97\u3067\u304d\u308b\u9818\u57df\u3068\u3001\u307e\u3060\u4fdd\u5b58\u3057\u3066\u3044\u306a\u3044\u552f\u4e00\u306e\u7d50\u679c\u304c\u3042\u308b\u9818\u57df\u3068\u3067\u306f\u3001MADV_DONTNEED\u3092\u4f7f\u3048\u308b\u5834\u9762\u304c\u5909\u308f\u308a\u307e\u3059\u3002<\/p>\n<h2>\u51fa\u5178<\/h2>\n<ol>\n<li><a href=\"https:\/\/man7.org\/linux\/man-pages\/man2\/madvise.2.html\">Linux man-pages 6.19 \u2014 madvise(2)<\/a>\u3002DESCRIPTION\u306eConventional advice values\u3001MADV_DONTNEED\u3001RETURN VALUE\u3092\u53c2\u7167\u3002\u4f8b\u3068\u56f3\u306f\u5f53\u8a72\u4ed5\u69d8\u3092\u8aac\u660e\u3059\u308b\u305f\u3081\u306e\u72ec\u81ea\u30e2\u30c7\u30eb\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u5927\u304d\u306a\u8a08\u7b97\u304c\u7d42\u308f\u308b\u3068\u3001\u9014\u4e2d\u3067\u4f7f\u3063\u305f\u30e1\u30e2\u30ea\u30fc\u304c\u4e0d\u8981\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3042\u3068\u3067\u540c\u3058\u30a2\u30c9\u30ec\u30b9\u3092\u4f7f\u3044\u305f\u3044\u306a\u3089\u3001\u9818\u57df\u306e\u5272\u308a\u5f53\u3066\u3092\u6b8b\u3057\u305f\u307e\u307e\u3001\u4e2d\u8eab\u3092\u624b\u653e\u3059\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002Linux\u3067\u306f\u3001madvise\u306bMADV_DONTNEED\u3092 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1295,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":false,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[30],"tags":[244],"class_list":["post-1297","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-computing","tag-linux"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-madv-dontneed-next-access-content-20261023-featured-bb10789a00d9.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1297","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1297"}],"version-history":[{"count":2,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1297\/revisions"}],"predecessor-version":[{"id":1593,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1297\/revisions\/1593"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/1295"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1297"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1297"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1297"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}