#include #include #include #include #include #include "dev.h" #include "str.h" #include "sock.h" #include "die.h" #include "link.h" int device_ifindex(const char *ifname) { int ret, sock, index; struct ifreq ifr; if (!strncmp("any", ifname, strlen("any"))) return 0; sock = af_socket(AF_INET); memset(&ifr, 0, sizeof(ifr)); strlcpy(ifr.ifr_name, ifname, IFNAMSIZ); ret = ioctl(sock, SIOCGIFINDEX, &ifr); if (!ret) index = ifr.ifr_ifindex; else index = -1; close(sock); return index; } static int __device_address6(const char *ifname, struct sockaddr_storage *ss) { int ret, family, found = -EINVAL; struct ifaddrs *ifaddr, *ifa; ret = getifaddrs(&ifaddr); if (ret < 0) panic("Cannot get device addresses for IPv6!\n"); for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { family = ifa->ifa_addr->sa_family; if (family != AF_INET6) continue; if (strcmp(ifa->ifa_name, ifname)) continue; memcpy(ss, ifa->ifa_addr, sizeof(*ss)); found = 0; break; } freeifaddrs(ifaddr); return found; } int device_address(const char *ifname, int af, struct sockaddr_storage *ss) { int ret, sock; struct ifreq ifr; if (!ss) return -EINVAL; if (!strncmp("any", ifname, strlen("any"))) return -EINVAL; if (af == AF_INET6) return __device_address6(ifname, ss); sock = af_socket(af); memset(&ifr, 0, sizeof(ifr)); strlcpy(ifr.ifr_name, ifname, IFNAMSIZ); ifr.ifr_addr.sa_family = af; ret = ioctl(sock, SIOCGIFADDR, &ifr); if (!ret) memcpy(ss, &ifr.ifr_addr, sizeof(ifr.ifr_addr)); close(sock); return ret; } int device_mtu(const char *ifname) { int ret, sock, mtu; struct ifreq ifr; sock = af_socket(AF_INET); memset(&ifr, 0, sizeof(ifr)); strlcpy(ifr.ifr_name, ifname, IFNAMSIZ); ret = ioctl(sock, SIOCGIFMTU, &ifr); if (!ret) mtu = ifr.ifr_mtu; else mtu = 0; close(sock); return mtu; } short device_get_flags(const char *ifname) { short flags; int ret, sock; struct ifreq ifr; sock = af_socket(AF_INET); memset(&ifr, 0, sizeof(ifr)); strlcpy(ifr.ifr_name, ifname, IFNAMSIZ); ret = ioctl(sock, SIOCGIFFLAGS, &ifr); if (!ret) flags = ifr.ifr_flags; else flags = 0; close(sock); return flags; } void device_set_flags(const char *ifname, const short flags) { int ret, sock; struct ifreq ifr; sock = af_socket(AF_INET); memset(&ifr, 0, sizeof(ifr)); strlcpy(ifr.ifr_name, ifname, IFNAMSIZ); ifr.ifr_flags = flags; ret = ioctl(sock, SIOCSIFFLAGS, &ifr); if (ret < 0) panic("Cannot set NIC flags!\n"); close(sock); } int device_up_and_running(char *ifname) { if (!ifname) return -EINVAL; if (!strncmp("any", ifname, strlen("any"))) return 1; return (device_get_flags(ifname) & (IFF_UP | IFF_RUNNING)) == (IFF_UP | IFF_RUNNING); } u32 device_bitrate(const char *ifname) { u32 speed_c, speed_w; speed_c = ethtool_bitrate(ifname); speed_w = wireless_bitrate(ifname); return (speed_c == 0 ? speed_w : speed_c); } bel'>context:space:mode:

author	Peter Zijlstra <peterz@infradead.org>	2016-06-21 14:27:50 +0200
committer	Ingo Molnar <mingo@kernel.org>	2016-06-27 12:17:54 +0200
commit	3d30544f02120b884bba2a9466c87dba980e3be5 (patch)
tree	86667a44a8bb7af2365e5bd501fc9b37008b8c24
parent	7dc603c9028ea5d4354e0e317e8481df99b06d7e (diff)

sched/fair: Apply more PELT fixes

One additional 'rule' for using update_cfs_rq_load_avg() is that one should call update_tg_load_avg() if it returns true. Add a bunch of comments to hopefully clarify some of the rules: o You need to update cfs_rq _before_ any entity attach/detach, this is important, because while for mathmatical consisency this isn't strictly needed, it is required for the physical interpretation of the model, you attach/detach _now_. o When you modify the cfs_rq avg, you have to then call update_tg_load_avg() in order to propagate changes upwards. o (Fair) entities are always attached, switched_{to,from}_fair() deal with !fair. This directly follows from the definition of the cfs_rq averages, namely that they are a direct sum of all (runnable or blocked) entities on that rq. It is the second rule that this patch enforces, but it adds comments pertaining to all of them. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>