Currently, we have histograms that show the sizes of ringbufs that ever used by SMC connections. However, they are always incremental and since SMC allows the reuse of ringbufs, we cannot know the actual amount of ringbufs being allocated or actively used. So this patch set introduces statistics for the amount of ringbufs that actually allocated by link group and actively used by connections of a certain net namespace, so that we can react based on these memory usage information, e.g. active fallback to TCP. With appropriate adaptations of smc-tools, we can obtain these ringbufs usage information: $ smcr -d linkgroup LG-ID : 00000500 LG-Role : SERV LG-Type : ASYML VLAN : 0 PNET-ID : Version : 1 Conns : 0 Sndbuf : 12910592 B <- RMB : 12910592 B <- or $ smcr -d stats [...] RX Stats Data transmitted (Bytes) 869225943 (869.2M) Total requests 18494479 Buffer usage (Bytes) 12910592 (12.31M) <- [...] TX Stats Data transmitted (Bytes) 12760884405 (12.76G) Total requests 36988338 Buffer usage (Bytes) 12910592 (12.31M) <- [...] [...] Wen Gu (2): net/smc: introduce statistics for allocated ringbufs of link group net/smc: introduce statistics for ringbufs usage of net namespace include/uapi/linux/smc.h | 6 ++++ net/smc/smc_core.c | 74 ++++++++++++++++++++++++++++++++++------ net/smc/smc_core.h | 2 ++ net/smc/smc_stats.c | 8 +++++ net/smc/smc_stats.h | 27 ++++++++++----- 5 files changed, 97 insertions(+), 20 deletions(-) -- 2.32.0.3.g01195cf9f
