From owner-freebsd-hackers@freebsd.org Wed Aug 7 09:56:59 2019 Return-Path: Delivered-To: freebsd-hackers@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id D5DCAC5045 for ; Wed, 7 Aug 2019 09:56:59 +0000 (UTC) (envelope-from brightiup.zhuo@gmail.com) Received: from mail-ot1-x344.google.com (mail-ot1-x344.google.com [IPv6:2607:f8b0:4864:20::344]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) server-signature RSA-PSS (4096 bits) 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 463Rk23kXTz4V9B for ; Wed, 7 Aug 2019 09:56:58 +0000 (UTC) (envelope-from brightiup.zhuo@gmail.com) Received: by mail-ot1-x344.google.com with SMTP id d17so102008793oth.5 for ; Wed, 07 Aug 2019 02:56:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=1GwVQYoBwGu/Oh4jMae3dTid4Xk+7vnj7vzKCWHuDT8=; b=Es+pDBExsRJ0fMdT+i5vYqzhPTiFYCNJINDdPQJLqcuFqkiOR3N/nEAkkxALdlUfgm VYU1LoIW6b3bFFjS56OO2mCTOwmRFBQg+mEmp7PCvRnObDu86MuDDadbjwvD30Y5AuQx kNP151/mTSj+GnXLjveHrrWQbhKQoPcY9bneitn0qFWcVklU+8fy2WsGS5BEOgYpCPI+ kjg6DEr8Ma7BmSXqGk7OhZlfcLfmyd6ELmqeh1E65Hz/j9xdOWuaIz9lrNkHahz27WUj eAOypcaa7Hx2K/JqNRC02XglBFini97vZT23Q9VpSwmzI2/f5T42VVvczfSk8RgdES6p kDeQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=1GwVQYoBwGu/Oh4jMae3dTid4Xk+7vnj7vzKCWHuDT8=; b=Y6/7BKij9HsdE2T9VsYPpEg6VCI9bcpb0wTB7RtAd2k3fT+/SSXAZBX7qU2svQAflB i/mxwlwhDXklHyKFWT/McljLR/D8xHnUYYO7S93jDRAF3Vl9mCAEH1WlPWOxGEAmup5H Xuu6wHAeb86vjQf2nqUCUmK3zyOrz1i8j7ZwO42PgjvV1tSOoGnSu+wmPCOZNct+5sz1 lwum1WE6Uit7xMK4Cx96h3QTK2hWuOltQGdEskS6Es5np3RBkgEhlMrHfkuaFa14Bhh6 GaXmIiy7DMcn2yN+45UOaEM5rybdqsmc2L3HxlBg1+URdgbr9GcVR1P5Oeyaqs+pff7x Gn9w== X-Gm-Message-State: APjAAAXPRsmrTR6P6h1AEoPMO1xJR0sedLF7PWic/7LDKKJXGrpRNDFY 1mYUAMJOx/bVgFcZJstp/XWigVh73y/RHjBdQH4= X-Google-Smtp-Source: APXvYqzQmWaUMmgkxvEQ8fVqWsR7FYndHwjBOmGwJpXQswWUmpPA1LBkt48UAO+R9b66IfB1wE90LL7Uk5Bwr8cWFZ0= X-Received: by 2002:a6b:6505:: with SMTP id z5mr8277824iob.295.1565171817149; Wed, 07 Aug 2019 02:56:57 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Liang Zhuo Date: Wed, 7 Aug 2019 17:56:46 +0800 Message-ID: Subject: Re: Force kernel epoch calls To: Hans Petter Selasky Cc: freebsd-hackers@freebsd.org X-Rspamd-Queue-Id: 463Rk23kXTz4V9B X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=Es+pDBEx; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of brightiupzhuo@gmail.com designates 2607:f8b0:4864:20::344 as permitted sender) smtp.mailfrom=brightiupzhuo@gmail.com X-Spamd-Result: default: False [-3.99 / 15.00]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; FREEMAIL_FROM(0.00)[gmail.com]; DKIM_TRACE(0.00)[gmail.com:+]; RCPT_COUNT_TWO(0.00)[2]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; NEURAL_HAM_SHORT(-0.99)[-0.989,0]; FROM_EQ_ENVFROM(0.00)[]; IP_SCORE(0.00)[ip: (2.30), ipnet: 2607:f8b0::/32(-3.04), asn: 15169(-2.44), country: US(-0.05)]; MIME_TRACE(0.00)[0:+,1:+,2:~]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; TAGGED_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; IP_SCORE_FREEMAIL(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[4.4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2019 09:56:59 -0000 Thanks for the quick reply. Actually, I just need some tricks in *userspace *to force the kernel to call those callbacks or some methods which could inform the kernel to call the callbacks. I am not writing a driver or kernel patch, it's just a userspace program which could escalate privilege to root. Thanks, Brightiup Hans Petter Selasky =E4=BA=8E2019=E5=B9=B48=E6=9C=887=E6= =97=A5=E5=91=A8=E4=B8=89 =E4=B8=8B=E5=8D=885:36=E5=86=99=E9=81=93=EF=BC=9A > On 2019-08-07 11:11, Liang Zhuo wrote: > > But I need to control the time of freeing > > of those objects as better as synchronization. > > Do do I have any methods to force these calls > > in epoch system to be called in userspace? > > Did you have a look at the recently added epoch_drain_callbacks() functio= n? > > --HPS >