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Tue, 24 Aug 2021 15:42:37 +0000 (UTC) Received: from fuller.cnet (ovpn-112-5.gru2.redhat.com [10.97.112.5]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 34F152C00F; Tue, 24 Aug 2021 15:42:30 +0000 (UTC) Received: by fuller.cnet (Postfix, from userid 1000) id 14DBA4175281; Tue, 24 Aug 2021 12:42:15 -0300 (-03) Message-ID: <20210824152646.784916432@fuller.cnet> User-Agent: quilt/0.66 Date: Tue, 24 Aug 2021 12:24:27 -0300 From: Marcelo Tosatti To: linux-kernel@vger.kernel.org Cc: Nitesh Lal , Nicolas Saenz Julienne , Frederic Weisbecker , Christoph Lameter , Juri Lelli , Peter Zijlstra , Alex Belits , Peter Xu Subject: [patch V3 4/8] procfs: add per-pid task isolation state References: <20210824152423.300346181@fuller.cnet> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add /proc/pid/task_isolation file, to query the state of task isolation configuration. --- fs/proc/base.c | 4 ++ include/linux/task_isolation.h | 2 + kernel/task_isolation.c | 60 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 66 insertions(+) Index: linux-2.6/fs/proc/base.c =================================================================== --- linux-2.6.orig/fs/proc/base.c +++ linux-2.6/fs/proc/base.c @@ -95,6 +95,8 @@ #include #include #include +#include +#include #include #include "internal.h" #include "fd.h" @@ -661,6 +663,69 @@ static int proc_pid_syscall(struct seq_f } #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ +#ifdef CONFIG_CPU_ISOLATION + +struct qoptions { + unsigned long mask; + char *name; +}; + +static struct qoptions iopts[] = { + {ISOL_F_QUIESCE, "quiesce"}, +}; +#define ILEN (sizeof(iopts) / sizeof(struct qoptions)) + +static struct qoptions qopts[] = { + {ISOL_F_QUIESCE_VMSTATS, "vmstat_sync"}, +}; +#define QLEN (sizeof(qopts) / sizeof(struct qoptions)) + +static void show_isolation_state(struct seq_file *m, + struct qoptions *iopt, + int mask, + const char *hdr) +{ + int i; + + seq_printf(m, hdr); + for (i = 0; i < ILEN; i++) { + if (mask & iopt->mask) + seq_printf(m, "%s ", iopt->name); + iopt++; + } + if (mask == 0) + seq_printf(m, "none "); + seq_printf(m, "\n"); +} + +int proc_pid_task_isolation(struct seq_file *m, struct pid_namespace *ns, + struct pid *pid, struct task_struct *t) +{ + int active_mask, quiesce_mask, conf_mask; + struct isol_info *isol_info; + struct inode *inode = m->private; + struct task_struct *task = get_proc_task(inode); + + isol_info = t->isol_info; + if (!isol_info) + active_mask = quiesce_mask = conf_mask = 0; + else { + active_mask = isol_info->active_mask; + quiesce_mask = isol_info->quiesce_mask; + conf_mask = isol_info->conf_mask; + } + + show_isolation_state(m, iopts, conf_mask, "Configured state: "); + show_isolation_state(m, iopts, active_mask, "Active state: "); + show_isolation_state(m, qopts, quiesce_mask, "Quiescing: "); + + put_task_struct(task); + + return 0; +} + +#endif /* CONFIG_CPU_ISOLATION */ + /************************************************************************/ /* Here the fs part begins */ /************************************************************************/ @@ -3278,6 +3343,9 @@ static const struct pid_entry tgid_base_ #ifdef CONFIG_SECCOMP_CACHE_DEBUG ONE("seccomp_cache", S_IRUSR, proc_pid_seccomp_cache), #endif +#ifdef CONFIG_CPU_ISOLATION + ONE("task_isolation", S_IRUSR, proc_pid_task_isolation), +#endif }; static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx)