From nobody Mon Jul 12 22:51:00 2021 X-Original-To: freebsd-hackers@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id A3BB81271E32 for ; Mon, 12 Jul 2021 22:51:05 +0000 (UTC) (envelope-from gusev.vitaliy@gmail.com) Received: from mail-qv1-xf32.google.com (mail-qv1-xf32.google.com [IPv6:2607:f8b0:4864:20::f32]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4GNzWs3zYfz4fW4; Mon, 12 Jul 2021 22:51:05 +0000 (UTC) (envelope-from gusev.vitaliy@gmail.com) Received: by mail-qv1-xf32.google.com with SMTP id o9so3215870qvu.5; Mon, 12 Jul 2021 15:51:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=yHWu/uRaJ5od/3MRZAV7dyNbrdO57QsIEJ608UL2LnA=; b=KXehpxVqLKDSaknvJzcIymhhJMkwS+Ha6sTRTiQOaN0h5eJrJVaDrMcI643BdZatyU rpmLE4bEqYW/BjTfjMnxM2pXWJVeRdxUWaWDHZRbFQYCznVTGgeeHjirKrJnZfjzXxpV rhBwE0iE3tu0gVJDnMwTjZp5EcSXoOcnQJUh5kfUmlozD7ZzOfBFYhuCtySXkJrBin1R bhbhufXc8/1HCB7ZBn6VKYG6erh1mHaFogo+LflaECWph51I5q3Opfdw3nqeT1VKv7jf wA0fJd7yvKfFbI0OirlW43JSF/dHOxEVQhMHYmRtviAETr9J3RqJzY0YAXThQ7HasJhW Tnqw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=yHWu/uRaJ5od/3MRZAV7dyNbrdO57QsIEJ608UL2LnA=; b=EX8oivVJJfTIm/SmlE0EaD9GuvMA3Y1oe/HTOuCgGH2Ozpy0hsfeQBUHi/FizOd+XP ZHOjtDyGsQQ0DrwJrsmjWTNHtdsTSbjSlb4IQyiuhnsI7qEuv4sL5wyKMVEPWZQTMXkh cLq7uIs1GlN/mrbxWeBH4FrfzxsBrSfH+3C9wsb47LwWfCpeoOJTPQmz/eq5ER5DmU30 4kqstrpLGFNkSF/qcURUJ6asd+hG3n3NKvVYz3HQ+NR+/tTQWJlGg0NU8MUK8ydRXYDO 0ZvWfVMjDgfeAZVDAi8bomhVl5P4+rgK/KsYOabVqsv8k/l4UW2e1EByhVAAuUO+yhcQ rLUw== X-Gm-Message-State: AOAM5323TFPsOKCNMiGojEGYfFJARlELiSG+QIe0dArMr17dVQW41SMk tkXIbbYiqnszPGfTpGVvXgw= X-Google-Smtp-Source: ABdhPJwQOWT6qRQ3G1n7Xd73ZF6qQYh0S8wEUwHD8BJhcyQNYEKAJm35lsqwRx4ehErXaSQul73f1g== X-Received: by 2002:ad4:5e8b:: with SMTP id jl11mr1452866qvb.36.1626130264467; Mon, 12 Jul 2021 15:51:04 -0700 (PDT) Received: from [10.42.0.5] ([188.187.60.230]) by smtp.gmail.com with ESMTPSA id n21sm3915203qkk.44.2021.07.12.15.51.02 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 12 Jul 2021 15:51:04 -0700 (PDT) From: Vitaliy Gusev Message-Id: Content-Type: multipart/alternative; boundary="Apple-Mail=_EC505346-0E0F-465D-B3B3-FED423966AA0" List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@freebsd.org Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.7\)) Subject: Re: madvise(MADV_FREE) doesn't work in some cases? Date: Tue, 13 Jul 2021 01:51:00 +0300 In-Reply-To: Cc: freebsd-hackers@freebsd.org, gljennjohn@gmail.com, Mark Johnston , Peter Grehan To: Konstantin Belousov References: <20210703065420.6dbafb5f@ernst.home> <2390FA9B-319E-45D4-BEA7-10878E43AD4B@gmail.com> <2A7A1E60-766D-427B-8288-E92B4090022E@gmail.com> <4C23FE3C-4FC3-41B2-9A6A-5C267CC0A0E0@gmail.com> X-Mailer: Apple Mail (2.3608.120.23.2.7) X-Rspamd-Queue-Id: 4GNzWs3zYfz4fW4 X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; none X-Spamd-Result: default: False [-4.00 / 15.00]; TAGGED_FROM(0.00)[]; REPLY(-4.00)[] X-ThisMailContainsUnwantedMimeParts: Y --Apple-Mail=_EC505346-0E0F-465D-B3B3-FED423966AA0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On 12 Jul 2021, at 22:52, Konstantin Belousov = wrote: >=20 > On Mon, Jul 12, 2021 at 02:55:37PM +0300, Vitaliy Gusev wrote: >> I guess madvise() should work well even with PAGE_SIZE granularity. = Usually a caller doesn=E2=80=99t need to free the whole region. As I = reported earlier madvise(PAGE_SIZE) works well in Linux and illumos.=20 >>=20 >> Current behaviour in FreeBSD can confuse programmers and brings = impossibility to effectively give back unused memory. Also I have = another case with madvise() but with shared memory that also doesn=E2=80=99= t work (but works in Linux and illumos), will report it in new thread. >>=20 >=20 > I want the confirmation or report that it still did not worked, for = the > case when my latest patch was applied and the test program switched to > the single call to madvise(2) for the whole region. >=20 Understood, checked. Patched kernel with single call of madvise(len, MADV_FREE) from = userspace still doesn=E2=80=99t work. The same condition if = (obj->backing_object !=3D NULL) is met, but once. =E2=80=94=E2=80=94 Vitaliy Gusev > After that, I can claim that the problem is understood and might = consider > some solutions. --Apple-Mail=_EC505346-0E0F-465D-B3B3-FED423966AA0--