On 01/13/2015 02:57 AM, Martin Kletzander wrote:
> This function uses sched_setscheduler() function so it works with
> processes and threads as well (even threads not created by us, which is
> what we'll need in the future).
>
> Signed-off-by: Martin Kletzander <mkletzan@xxxxxxxxxx>
> ---
> src/libvirt_private.syms | 1 +
> src/util/virprocess.c | 46 ++++++++++++++++++++++++++++++++++++++++++++--
> src/util/virprocess.h | 6 +++++-
> 3 files changed, 50 insertions(+), 3 deletions(-)
>
> diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
> index fb5d003..de3476e 100644
> --- a/src/libvirt_private.syms
> +++ b/src/libvirt_private.syms
> @@ -1882,6 +1882,7 @@ virProcessSetMaxFiles;
> virProcessSetMaxMemLock;
> virProcessSetMaxProcesses;
> virProcessSetNamespaces;
> +virProcessSetScheduler;
> virProcessTranslateStatus;
> virProcessWait;
>
> diff --git a/src/util/virprocess.c b/src/util/virprocess.c
> index d0a1500..85da5e8 100644
> --- a/src/util/virprocess.c
> +++ b/src/util/virprocess.c
> @@ -1,7 +1,7 @@
> /*
> * virprocess.c: interaction with processes
> *
> - * Copyright (C) 2010-2014 Red Hat, Inc.
> + * Copyright (C) 2010-2015 Red Hat, Inc.
> *
> * This library is free software; you can redistribute it and/or
> * modify it under the terms of the GNU Lesser General Public
> @@ -32,7 +32,6 @@
> # include <sys/time.h>
> # include <sys/resource.h>
> #endif
> -#include <sched.h>
hmm.. moving to virprocess.h....
>
> #if defined(__FreeBSD__) || HAVE_BSD_CPU_AFFINITY
> # include <sys/param.h>
> @@ -1052,3 +1051,46 @@ virProcessExitWithStatus(int status)
> }
> exit(value);
> }
> +
> +int
> +virProcessSetScheduler(pid_t pid, int policy, int priority)
> +{
> + struct sched_param param = {0};
> +
> + VIR_DEBUG("pid=%d, policy=%d, priority=%u", pid, policy, priority);
> +
> + if (policy == SCHED_FIFO || policy == SCHED_RR) {
> + int min = 0;
> + int max = 0;
> +
> + if ((min = sched_get_priority_min(policy)) < 0) {
> + virReportSystemError(errno, "%s",
> + _("Cannot get minimum scheduler priority value"));
> + return -1;
> + }
> +
> + if ((max = sched_get_priority_max(policy)) < 0) {
> + virReportSystemError(errno, "%s",
> + _("Cannot get maximum scheduler priority value"));
> + return -1;
> + }
> +
> + if (priority < min || priority > max) {
> + virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> + _("Scheduler priority %d out of range [%d, %d]"),
> + priority, min, max);
> + return -1;
> + }
> +
> + param.sched_priority = priority;
> + }
> +
> + if (sched_setscheduler(pid, policy, ¶m) < 0) {
> + virReportSystemError(errno,
> + _("Cannot set scheduler parameters for pid %d"),
> + pid);
> + return -1;
> + }
> +
> + return 0;
> +}
> diff --git a/src/util/virprocess.h b/src/util/virprocess.h
> index bcaede5..34b15a4 100644
> --- a/src/util/virprocess.h
> +++ b/src/util/virprocess.h
> @@ -1,7 +1,7 @@
> /*
> * virprocess.h: interaction with processes
> *
> - * Copyright (C) 2010-2014 Red Hat, Inc.
> + * Copyright (C) 2010-2015 Red Hat, Inc.
> *
> * This library is free software; you can redistribute it and/or
> * modify it under the terms of the GNU Lesser General Public
> @@ -23,6 +23,7 @@
> # define __VIR_PROCESS_H__
>
> # include <sys/types.h>
> +# include <sched.h>
Does moving this into here work for other build platforms? Is it
required - it doesn't seem so given all that changes doesn't include
anything sched.h specific.
John
>
> # include "internal.h"
> # include "virbitmap.h"
> @@ -73,4 +74,7 @@ typedef int (*virProcessNamespaceCallback)(pid_t pid, void *opaque);
> int virProcessRunInMountNamespace(pid_t pid,
> virProcessNamespaceCallback cb,
> void *opaque);
> +
> +int virProcessSetScheduler(pid_t pid, int policy, int priority);
> +
> #endif /* __VIR_PROCESS_H__ */
>
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