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Re: [Xen-devel] [PATCH 5/5] tools/libxc: allow controlling the max C-state sub-state
- To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 10 Jun 2019 17:54:34 +0100
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- Cc: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 10 Jun 2019 16:54:47 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 23/05/2019 13:19, Jan Beulich wrote:
> From: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
>
> Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
>
> Make handling in do_pm_op() more homogeneous: Before interpreting
> op->cpuid as such, handle all operations not acting on a particular
> CPU. Also expose the setting via xenpm.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> --- a/tools/libxc/xc_pm.c
> +++ b/tools/libxc/xc_pm.c
> @@ -379,7 +379,7 @@ int xc_get_cpuidle_max_cstate(xc_interfa
> }
> sysctl.cmd = XEN_SYSCTL_pm_op;
> sysctl.u.pm_op.cmd = XEN_SYSCTL_pm_op_get_max_cstate;
> - sysctl.u.pm_op.cpuid = 0;
> + sysctl.u.pm_op.cpuid = type;
What is type, and why it is being put into a field called cpuid?
> --- a/tools/misc/xenpm.c
> +++ b/tools/misc/xenpm.c
> @@ -1120,13 +1128,17 @@ void get_vcpu_migration_delay_func(int a
>
> void set_max_cstate_func(int argc, char *argv[])
> {
> - int value;
> + int value, subval = XEN_SYSCTL_CX_UNLIMITED;
> char buf[12];
>
> - if ( argc != 1 ||
> + if ( argc < 1 || argc > 2 ||
> (sscanf(argv[0], "%d", &value) == 1
> ? value < 0
> - : (value = XEN_SYSCTL_CX_UNLIMITED, strcmp(argv[0], "unlimited")))
> )
> + : (value = XEN_SYSCTL_CX_UNLIMITED, strcmp(argv[0], "unlimited")))
> ||
> + (argc == 2 &&
> + (sscanf(argv[1], "%d", &subval) == 1
> + ? subval < 0
> + : (subval = XEN_SYSCTL_CX_UNLIMITED, strcmp(argv[1],
> "unlimited")))) )
Usage update?
~Andrew
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