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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=YF0nJGr2F3cAY4yWpx0AziwiF6WyFVyJ2P8U7ZMBQ2k=; b=qKj4q6pXR+DJXrj9SjhPZAqC1U3JyI1MXxwfa2XzsfKnWciNkMxQ6rAkBmFKHjnpSn UoBaiKr6lMlRTEx4aDBB67ZfBfECiuUz9DQlo1Mf5+hkAXyRxGo4peNkU4hB9fpsFpYK YFItjkLw5dQ3IhR8n7db7tKogGEDzF6qNXqX2j1OVQuZV+mKgkn3dMefG7xh3eQBD98g BdxVlqIk8hqMdhzm2LH9efY06obGWoOo4dTf7r3rsAgntDLVrKtKdLG8c7v5fZ8F8Vk1 KC0cQiedV71nFcJrgE0Rvs9nu77+ud3ed+vTHz1MEoBu/OvzJm9h5Pjs+tzs7MDFUUB2 +Mkw== X-Gm-Message-State: AOAM530nKHXmmED8jxYBsr5+jma3NriiOeVeBJeC1l/369fOf9YP6lH5 lc4T15XoNd9OBCCfDhHHpwzwxNu9aM9QDW/1pjg= X-Google-Smtp-Source: ABdhPJxUXsDlKLE4/vBP0zD1S+wpZ+CiVLOikj2CtG05js/EKJ0IaEtzXPWZAceSn8Lj9ydytAspFmr6LW1xwJj8ugg= X-Received: by 2002:a17:907:6e0b:: with SMTP id sd11mr7258908ejc.134.1636448157072; Tue, 09 Nov 2021 00:55:57 -0800 (PST) MIME-Version: 1.0 References: <20211104195804.83240-1-posk@google.com> In-Reply-To: <20211104195804.83240-1-posk@google.com> From: Barry Song <21cnbao@gmail.com> Date: Tue, 9 Nov 2021 21:55:45 +1300 Message-ID: Subject: Re: [PATCH v0.8 0/6] sched,mm,x86/uaccess: implement User Managed Concurrency Groups To: posk@posk.io Cc: Peter Zijlstra , Ingo Molnar , Thomas Gleixner , Andrew Morton , Dave Hansen , Andy Lutomirski , Linux-MM , LKML , linux-api@vger.kernel.org, Paul Turner , Ben Segall , Peter Oskolkov , Andrei Vagin , Jann Horn , Thierry Delisle Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 54192700171D X-Stat-Signature: ppn6bwh99usnjobdj4r8uf7mgyu3eti4 Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=Rd9tJkCs; spf=pass (imf02.hostedemail.com: domain of 21cnbao@gmail.com designates 209.85.208.46 as permitted sender) smtp.mailfrom=21cnbao@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-HE-Tag: 1636448152-923218 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Nov 5, 2021 at 8:58 AM Peter Oskolkov wrote: > > User Managed Concurrency Groups (UMCG) is an M:N threading > subsystem/toolkit that lets user space application developers implement > in-process user space schedulers. > > Key changes from the previous patchset > https://lore.kernel.org/all/20211012232522.714898-1-posk@google.com/: > > - added libumcg tools/lib/umcg; > - worker "wakeup" is reworked so that it is now purely a userspace op, > instead of waking the thread in order for it to block on return > to the userspace immediately; > - a couple of minor fixes and refactorings. > > These big things remain to be addressed (in no particular order): > - support tracing/debugging > - make context switches faster (see umcg_do_context_switch in umcg.c) > - support other architectures > - cleanup and post selftests in tools/testing/selftests/umcg/ > - allow cross-mm wakeups (securely) > > > Peter Oskolkov (6): > sched/umcg: add WF_CURRENT_CPU and externise ttwu > mm, x86/uaccess: add userspace atomic helpers > sched/umcg: implement UMCG syscalls > sched/umcg, lib/umcg: implement libumcg > sched/umcg: add Documentation/userspace-api/umcg.txt > sched/umcg, lib/umcg: add tools/lib/umcg/libumcg.txt Hi Peter, Do you have a real workload or an example application using UMCG? > > Documentation/userspace-api/umcg.txt | 598 ++++++++++++ > arch/x86/entry/syscalls/syscall_64.tbl | 2 + > arch/x86/include/asm/uaccess_64.h | 93 ++ > fs/exec.c | 1 + > include/linux/sched.h | 71 ++ > include/linux/syscalls.h | 3 + > include/linux/uaccess.h | 46 + > include/uapi/asm-generic/unistd.h | 6 +- > include/uapi/linux/umcg.h | 137 +++ > init/Kconfig | 10 + > kernel/entry/common.c | 4 +- > kernel/exit.c | 5 + > kernel/sched/Makefile | 1 + > kernel/sched/core.c | 12 +- > kernel/sched/fair.c | 4 + > kernel/sched/sched.h | 15 +- > kernel/sched/umcg.c | 949 +++++++++++++++++++ > kernel/sys_ni.c | 4 + > mm/maccess.c | 264 ++++++ > tools/lib/umcg/.gitignore | 4 + > tools/lib/umcg/Makefile | 11 + > tools/lib/umcg/libumcg.c | 1201 ++++++++++++++++++++++++ > tools/lib/umcg/libumcg.h | 299 ++++++ > tools/lib/umcg/libumcg.txt | 438 +++++++++ > 24 files changed, 4166 insertions(+), 12 deletions(-) > create mode 100644 Documentation/userspace-api/umcg.txt > create mode 100644 include/uapi/linux/umcg.h > create mode 100644 kernel/sched/umcg.c > create mode 100644 tools/lib/umcg/.gitignore > create mode 100644 tools/lib/umcg/Makefile > create mode 100644 tools/lib/umcg/libumcg.c > create mode 100644 tools/lib/umcg/libumcg.h > create mode 100644 tools/lib/umcg/libumcg.txt > > > base-commit: 8ea9183db4ad8afbcb7089a77c23eaf965b0cacd > -- > 2.25.1 > Thanks Barry