diff options
| -rw-r--r-- | tools/testing/selftests/net/tcp_mmap.c | 58 |
1 files changed, 53 insertions, 5 deletions
diff --git a/tools/testing/selftests/net/tcp_mmap.c b/tools/testing/selftests/net/tcp_mmap.c index 0e73a30f0c22..5bb370a0857e 100644 --- a/tools/testing/selftests/net/tcp_mmap.c +++ b/tools/testing/selftests/net/tcp_mmap.c @@ -82,7 +82,9 @@ static int zflg; /* zero copy option. (MSG_ZEROCOPY for sender, mmap() for recei static int xflg; /* hash received data (simple xor) (-h option) */ static int keepflag; /* -k option: receiver shall keep all received file in memory (no munmap() calls) */ -static int chunk_size = 512*1024; +static size_t chunk_size = 512*1024; + +static size_t map_align; unsigned long htotal; @@ -118,6 +120,9 @@ void hash_zone(void *zone, unsigned int length) htotal = temp; } +#define ALIGN_UP(x, align_to) (((x) + ((align_to)-1)) & ~((align_to)-1)) +#define ALIGN_PTR_UP(p, ptr_align_to) ((typeof(p))ALIGN_UP((unsigned long)(p), ptr_align_to)) + void *child_thread(void *arg) { unsigned long total_mmap = 0, total = 0; @@ -126,6 +131,7 @@ void *child_thread(void *arg) int flags = MAP_SHARED; struct timeval t0, t1; char *buffer = NULL; + void *raddr = NULL; void *addr = NULL; double throughput; struct rusage ru; @@ -142,9 +148,13 @@ void *child_thread(void *arg) goto error; } if (zflg) { - addr = mmap(NULL, chunk_size, PROT_READ, flags, fd, 0); - if (addr == (void *)-1) + raddr = mmap(NULL, chunk_size + map_align, PROT_READ, flags, fd, 0); + if (raddr == (void *)-1) { + perror("mmap"); zflg = 0; + } else { + addr = ALIGN_PTR_UP(raddr, map_align); + } } while (1) { struct pollfd pfd = { .fd = fd, .events = POLLIN, }; @@ -222,7 +232,7 @@ error: free(buffer); close(fd); if (zflg) - munmap(addr, chunk_size); + munmap(raddr, chunk_size + map_align); pthread_exit(0); } @@ -303,6 +313,30 @@ static void do_accept(int fdlisten) } } +/* Each thread should reserve a big enough vma to avoid + * spinlock collisions in ptl locks. + * This size is 2MB on x86_64, and is exported in /proc/meminfo. + */ +static unsigned long default_huge_page_size(void) +{ + FILE *f = fopen("/proc/meminfo", "r"); + unsigned long hps = 0; + size_t linelen = 0; + char *line = NULL; + + if (!f) + return 0; + while (getline(&line, &linelen, f) > 0) { + if (sscanf(line, "Hugepagesize: %lu kB", &hps) == 1) { + hps <<= 10; + break; + } + } + free(line); + fclose(f); + return hps; +} + int main(int argc, char *argv[]) { struct sockaddr_storage listenaddr, addr; @@ -314,7 +348,7 @@ int main(int argc, char *argv[]) int sflg = 0; int mss = 0; - while ((c = getopt(argc, argv, "46p:svr:w:H:zxkP:M:")) != -1) { + while ((c = getopt(argc, argv, "46p:svr:w:H:zxkP:M:C:a:")) != -1) { switch (c) { case '4': cfg_family = PF_INET; @@ -354,10 +388,24 @@ int main(int argc, char *argv[]) case 'P': max_pacing_rate = atoi(optarg) ; break; + case 'C': + chunk_size = atol(optarg); + break; + case 'a': + map_align = atol(optarg); + break; default: exit(1); } } + if (!map_align) { + map_align = default_huge_page_size(); + /* if really /proc/meminfo is not helping, + * we use the default x86_64 hugepagesize. + */ + if (!map_align) + map_align = 2*1024*1024; + } if (sflg) { int fdlisten = socket(cfg_family, SOCK_STREAM, 0); |