[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen master] libxc/libxl: allow to retrieve the number of online pCPUs
commit 62f25a16a47e62b2abbabd3c24c30c2545c5e312 Author: Dario Faggioli <dario.faggioli@xxxxxxxxxx> AuthorDate: Sat Dec 7 01:05:11 2013 +0100 Commit: Ian Campbell <ian.campbell@xxxxxxxxxx> CommitDate: Mon Dec 9 15:20:12 2013 +0000 libxc/libxl: allow to retrieve the number of online pCPUs by introducing introduce xc_get_online_cpus() and libxl_get_online_cpus(). Signed-off-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx> Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx> --- tools/libxc/xc_misc.c | 10 ++++++++++ tools/libxc/xenctrl.h | 3 +++ tools/libxl/libxl.h | 8 ++++++++ tools/libxl/libxl_utils.c | 7 +++++++ 4 files changed, 28 insertions(+), 0 deletions(-) diff --git a/tools/libxc/xc_misc.c b/tools/libxc/xc_misc.c index c771469..00cd0d8 100644 --- a/tools/libxc/xc_misc.c +++ b/tools/libxc/xc_misc.c @@ -38,6 +38,16 @@ int xc_get_max_cpus(xc_interface *xch) return -1; } +int xc_get_online_cpus(xc_interface *xch) +{ + xc_physinfo_t physinfo; + + if ( !xc_physinfo(xch, &physinfo) ) + return physinfo.nr_cpus; + + return -1; +} + int xc_get_max_nodes(xc_interface *xch) { static int max_nodes = 0; diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h index cced208..6e58ebe 100644 --- a/tools/libxc/xenctrl.h +++ b/tools/libxc/xenctrl.h @@ -356,6 +356,9 @@ typedef uint8_t *xc_cpumap_t; /* return maximum number of cpus the hypervisor supports */ int xc_get_max_cpus(xc_interface *xch); +/* return the number of online cpus */ +int xc_get_online_cpus(xc_interface *xch); + /* return array size for cpumap */ int xc_get_cpumap_size(xc_interface *xch); diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h index 75b64ea..12d6c31 100644 --- a/tools/libxl/libxl.h +++ b/tools/libxl/libxl.h @@ -677,6 +677,14 @@ int libxl_domain_preserve(libxl_ctx *ctx, uint32_t domid, libxl_domain_create_in /* get max. number of cpus supported by hypervisor */ int libxl_get_max_cpus(libxl_ctx *ctx); +/* get the actual number of currently online cpus on the host */ +int libxl_get_online_cpus(libxl_ctx *ctx); + /* Beware that no locking or serialization is provided by libxl, + * so the information can be outdated as far as the function + * returns. If there are other entities in the system capable + * of onlining/offlining CPUs, it is up to the application + * to guarantee consistency, if that is important. */ + /* get max. number of NUMA nodes supported by hypervisor */ int libxl_get_max_nodes(libxl_ctx *ctx); diff --git a/tools/libxl/libxl_utils.c b/tools/libxl/libxl_utils.c index 0833de2..c9cef66 100644 --- a/tools/libxl/libxl_utils.c +++ b/tools/libxl/libxl_utils.c @@ -776,6 +776,13 @@ int libxl_get_max_cpus(libxl_ctx *ctx) return max_cpus < 0 ? ERROR_FAIL : max_cpus; } +int libxl_get_online_cpus(libxl_ctx *ctx) +{ + int online_cpus = xc_get_online_cpus(ctx->xch); + + return online_cpus < 0 ? ERROR_FAIL : online_cpus; +} + int libxl_get_max_nodes(libxl_ctx *ctx) { int max_nodes = xc_get_max_nodes(ctx->xch); -- generated by git-patchbot for /home/xen/git/xen.git#master _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxx http://lists.xensource.com/xen-changelog
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