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Wed, 22 Jan 2025 17:10:01 -0800 (PST) Message-ID: Date: Thu, 23 Jan 2025 01:10:35 +0000 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 0/9] Launching processes with io_uring From: Pavel Begunkov To: Askar Safin Cc: axboe , io-uring , josh , krisman References: <20250118223309.3930747-1-safinaskar@zohomail.com> <9ee30fc7-0329-4a69-b686-3131ce323c97@gmail.com> <194906b5253.5821bf1b68241.219025268281574714@zohomail.com> Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 1/23/25 00:31, Pavel Begunkov wrote: > On 1/22/25 23:49, Askar Safin wrote: >>   ---- On Sun, 19 Jan 2025 07:03:51 +0400  Pavel Begunkov  wrote --- >>   > I also wonder, if copying the page table is a performance problem, why >>   > CLONE_VM + exec is not an option? >> >> Do you mean CLONE_VFORK? Anyway, CLONE_VM surprisingly turns out > > No, vfork is troublesome. What I mean is a task that shares > the page table, or in other words a vfork that doesn't block > and has a dedicated stack. > >> to be a good solution. So thank you! >> >> There is a bug in libc or in Linux: https://sourceware.org/bugzilla/show_bug.cgi?id=32565 . >> >> I suspect this is actually a Linux bug. >> >> After receiving your letter I decided to try CLONE_VM. And it works! >> There is no bug in CLONE_VM version! You can see more details here: >> https://www.openwall.com/lists/musl/2025/01/22/1 > > I haven't looked at the bug, but IIUC fundamentally posix_spawn() > does the same thing, and if so it's likely that any problem you > have with posix_spawn() could be triggered for your hand crafted > version. Seems I was wrong, posix_spawn(3) mentions it uses CLONE_VFORK. -- Pavel Begunkov