Messages in this thread Patch in this message | | | Date | Mon, 29 Oct 2012 16:27:30 -0400 | From | Steven Rostedt <> | Subject | [PATCH 19/32] x86: Syscall hooks for nohz cpusets |
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From: Frederic Weisbecker <fweisbec@gmail.com>
Add syscall hooks to notify syscall entry and exit on CPUs running in adative nohz mode.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Alessio Igor Bogani <abogani@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Avi Kivity <avi@redhat.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Christoph Lameter <cl@linux.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Geoff Levand <geoff@infradead.org> Cc: Gilad Ben Yossef <gilad@benyossef.com> Cc: Hakan Akkan <hakanakkan@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Kevin Hilman <khilman@ti.com> Cc: Max Krasnyansky <maxk@qualcomm.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephen Hemminger <shemminger@vyatta.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Sven-Thorsten Dietrich <thebigcorporation@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> --- arch/x86/kernel/ptrace.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c index b00b33a..9c18e1e 100644 --- a/arch/x86/kernel/ptrace.c +++ b/arch/x86/kernel/ptrace.c @@ -22,6 +22,7 @@ #include <linux/perf_event.h> #include <linux/hw_breakpoint.h> #include <linux/rcupdate.h> +#include <linux/tick.h> #include <asm/uaccess.h> #include <asm/pgtable.h> @@ -1461,6 +1462,10 @@ long syscall_trace_enter(struct pt_regs *regs) { long ret = 0; + /* Notify nohz task syscall early so the rest can use rcu */ + /* (SDR: Does the rcu_user_exit() make this obsolete?) */ + tick_nohz_enter_kernel(); + rcu_user_exit(); /* @@ -1528,4 +1533,10 @@ void syscall_trace_leave(struct pt_regs *regs) tracehook_report_syscall_exit(regs, step); rcu_user_enter(); + /* + * Notify nohz task exit syscall at last so the rest can + * use rcu. + * (SDR: does the above make this obsolete?) + */ + tick_nohz_exit_kernel(); } -- 1.7.10.4
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