[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1541528590-30296-2-git-send-email-aubrey.li@intel.com>
Date: Wed, 7 Nov 2018 02:23:10 +0800
From: Aubrey Li <aubrey.li@...el.com>
To: tglx@...utronix.de, mingo@...hat.com, peterz@...radead.org,
hpa@...or.com
Cc: ak@...ux.intel.com, tim.c.chen@...ux.intel.com,
arjan@...ux.intel.com, aubrey.li@...el.com,
linux-kernel@...r.kernel.org, Aubrey Li <aubrey.li@...ux.intel.com>
Subject: [RFC PATCH v1 2/2] proc: add /proc/<pid>/thread_state
Expose the per-task cpu specific thread state value, it's helpful
for userland to classify and schedule the tasks by different policies
Signed-off-by: Aubrey Li <aubrey.li@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
---
arch/x86/kernel/fpu/xstate.c | 13 +++++++++++++
fs/proc/base.c | 13 +++++++++++++
2 files changed, 26 insertions(+)
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 87a57b7..5a4a1d5 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -7,6 +7,7 @@
#include <linux/cpu.h>
#include <linux/mman.h>
#include <linux/pkeys.h>
+#include <linux/seq_file.h>
#include <asm/fpu/api.h>
#include <asm/fpu/internal.h>
@@ -1245,3 +1246,15 @@ int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf)
return 0;
}
+
+/*
+ * report AVX state
+ */
+void arch_thread_state(struct seq_file *m, struct task_struct *task)
+{
+ if (task->thread.fpu.avx.state)
+ seq_putc(m, '1');
+ else
+ seq_putc(m, '0');
+ seq_putc(m, '\n');
+}
diff --git a/fs/proc/base.c b/fs/proc/base.c
index aaffc0c..be24327 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2893,6 +2893,17 @@ static int proc_pid_patch_state(struct seq_file *m, struct pid_namespace *ns,
}
#endif /* CONFIG_LIVEPATCH */
+void __weak arch_thread_state(struct seq_file *m, struct task_struct *task)
+{
+}
+
+static int proc_pid_thread_state(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
+{
+ arch_thread_state(m, task);
+ return 0;
+}
+
/*
* Thread groups
*/
@@ -2994,6 +3005,7 @@ static const struct pid_entry tgid_base_stuff[] = {
#ifdef CONFIG_LIVEPATCH
ONE("patch_state", S_IRUSR, proc_pid_patch_state),
#endif
+ ONE("thread_state", S_IRUSR, proc_pid_thread_state),
};
static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx)
@@ -3372,6 +3384,7 @@ static const struct pid_entry tid_base_stuff[] = {
#ifdef CONFIG_LIVEPATCH
ONE("patch_state", S_IRUSR, proc_pid_patch_state),
#endif
+ ONE("thread_state", S_IRUSR, proc_pid_thread_state),
};
static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx)
--
2.7.4
Powered by blists - more mailing lists