From: Paul Mackerras Date: Tue, 24 Mar 2009 05:52:34 +0000 (+1100) Subject: perf_counter tools: remove glib dependency and fix bugs in kerneltop.c X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=cbe46555dc4de6403cd757139d42289b5f21abb9;p=openwrt%2Fstaging%2Fblogic.git perf_counter tools: remove glib dependency and fix bugs in kerneltop.c The glib dependency in kerneltop.c is only for a little bit of list manipulation, and I find it inconvenient. This adds a 'next' field to struct source_line, which lets us link them together into a list. The code to do the linking ourselves turns out to be no longer or more difficult than using glib. This also fixes a few other problems: - We need to #include to get PATH_MAX on powerpc. - We need to #include rather than have our own definitions of __u64 and __s64; on powerpc the installed headers define them to be unsigned long and long respectively, and if we have our own, different definition here that causes a compile error. - This takes out the x86 setting of errno from -ret in sys_perf_counter_open. My experiments on x86 indicate that the glibc syscall() does this for us already. - We had two CPU migration counters in the default set, which seems unnecessary; I changed one of them to a context switch counter. - In perfstat mode we were printing CPU cycles and instructions as milliseconds, and the cpu clock and task clock counters as events. This fixes that. - In perfstat mode we were still printing a blank line after the first counter, which was a holdover from when a task clock counter was automatically included as the first counter. This removes the blank line. - On a test machine here, parse_symbols() and parse_vmlinux() were taking long enough (almost 0.5 seconds) for the mmap buffer to overflow before we got to the first mmap_read() call, so this moves them before we open all the counters. - The error message if sys_perf_counter_open fails needs to use errno, not -fd[i][counter]. Signed-off-by: Paul Mackerras Acked-by: Peter Zijlstra Acked-by: Mike Galbraith Cc: Arjan van de Ven Orig-LKML-Reference: <18888.29986.340328.540512@cargo.ozlabs.ibm.com> Signed-off-by: Ingo Molnar --- diff --git a/Documentation/perf_counter/Makefile b/Documentation/perf_counter/Makefile index 666da95a7877..194b66215588 100644 --- a/Documentation/perf_counter/Makefile +++ b/Documentation/perf_counter/Makefile @@ -3,7 +3,7 @@ BINS = kerneltop perfstat all: $(BINS) kerneltop: kerneltop.c ../../include/linux/perf_counter.h - cc -O6 -Wall -lrt `pkg-config --cflags --libs glib-2.0` -o $@ $< + cc -O6 -Wall -lrt -o $@ $< perfstat: kerneltop ln -sf kerneltop perfstat diff --git a/Documentation/perf_counter/kerneltop.c b/Documentation/perf_counter/kerneltop.c index 2ab29b5e32e8..ea13e4e67229 100644 --- a/Documentation/perf_counter/kerneltop.c +++ b/Documentation/perf_counter/kerneltop.c @@ -3,7 +3,7 @@ Build with: - cc -O6 -Wall -lrt `pkg-config --cflags --libs glib-2.0` -o kerneltop kerneltop.c + cc -O6 -Wall -c -o kerneltop.o kerneltop.c -lrt Sample output: @@ -56,6 +56,7 @@ * Yanmin Zhang * Wu Fengguang * Mike Galbraith + * Paul Mackerras * * Released under the GPL v2. (and only v2, not any later version) */ @@ -68,6 +69,7 @@ #include #include #include +#include #include #include #include @@ -76,8 +78,6 @@ #include #include -#include - #include #include #include @@ -87,6 +87,7 @@ #include #include +#include #include "../../include/linux/perf_counter.h" @@ -114,11 +115,6 @@ #define __user #define asmlinkage -typedef unsigned int __u32; -typedef unsigned long long __u64; -typedef long long __s64; - - #ifdef __x86_64__ #define __NR_perf_counter_open 295 #define rmb() asm volatile("lfence" ::: "memory") @@ -146,17 +142,8 @@ asmlinkage int sys_perf_counter_open( int group_fd, unsigned long flags) { - int ret; - - ret = syscall( + return syscall( __NR_perf_counter_open, hw_event_uptr, pid, cpu, group_fd, flags); -#if defined(__x86_64__) || defined(__i386__) - if (ret < 0 && ret > -4096) { - errno = -ret; - ret = -1; - } -#endif - return ret; } #define MAX_COUNTERS 64 @@ -170,7 +157,7 @@ static int system_wide = 0; static int nr_counters = 0; static __u64 event_id[MAX_COUNTERS] = { EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK), - EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), + EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), @@ -202,14 +189,15 @@ static int delay_secs = 2; static int zero; static int dump_symtab; -static GList *lines; - struct source_line { uint64_t EIP; unsigned long count; char *line; + struct source_line *next; }; +static struct source_line *lines; +static struct source_line **lines_tail; const unsigned int default_count[] = { 1000000, @@ -519,9 +507,8 @@ int do_perfstat(int argc, char *argv[]) count += single_count; } - if (!PERF_COUNTER_RAW(event_id[counter]) && - (event_id[counter] == PERF_COUNT_CPU_CLOCK || - event_id[counter] == PERF_COUNT_TASK_CLOCK)) { + if (event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK) || + event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK)) { double msecs = (double)count / 1000000; @@ -531,8 +518,6 @@ int do_perfstat(int argc, char *argv[]) fprintf(stderr, " %14Ld %-20s (events)\n", count, event_name(counter)); } - if (!counter) - fprintf(stderr, "\n"); } fprintf(stderr, "\n"); fprintf(stderr, " Wall-clock time elapsed: %12.6f msecs\n", @@ -554,7 +539,7 @@ struct sym_entry { char *sym; unsigned long count[MAX_COUNTERS]; int skip; - GList *source; + struct source_line *source; }; #define MAX_SYMS 100000 @@ -855,6 +840,7 @@ static void parse_vmlinux(char *filename) if (!file) return; + lines_tail = &lines; while (!feof(file)) { struct source_line *src; size_t dummy = 0; @@ -873,7 +859,9 @@ static void parse_vmlinux(char *filename) if (c) *c = 0; - lines = g_list_prepend(lines, src); + src->next = NULL; + *lines_tail = src; + lines_tail = &src->next; if (strlen(src->line)>8 && src->line[8] == ':') src->EIP = strtoull(src->line, NULL, 16); @@ -881,52 +869,43 @@ static void parse_vmlinux(char *filename) src->EIP = strtoull(src->line, NULL, 16); } pclose(file); - lines = g_list_reverse(lines); } static void record_precise_ip(uint64_t ip) { struct source_line *line; - GList *item; - item = g_list_first(lines); - while (item) { - line = item->data; + for (line = lines; line; line = line->next) { if (line->EIP == ip) line->count++; if (line->EIP > ip) break; - item = g_list_next(item); } } static void lookup_sym_in_vmlinux(struct sym_entry *sym) { struct source_line *line; - GList *item; char pattern[PATH_MAX]; sprintf(pattern, "<%s>:", sym->sym); - item = g_list_first(lines); - while (item) { - line = item->data; + for (line = lines; line; line = line->next) { if (strstr(line->line, pattern)) { - sym->source = item; + sym->source = line; break; } - item = g_list_next(item); } } -void show_lines(GList *item_queue, int item_queue_count) +static void show_lines(struct source_line *line_queue, int line_queue_count) { int i; struct source_line *line; - for (i = 0; i < item_queue_count; i++) { - line = item_queue->data; + line = line_queue; + for (i = 0; i < line_queue_count; i++) { printf("%8li\t%s\n", line->count, line->line); - item_queue = g_list_next(item_queue); + line = line->next; } } @@ -935,10 +914,9 @@ void show_lines(GList *item_queue, int item_queue_count) static void show_details(struct sym_entry *sym) { struct source_line *line; - GList *item; + struct source_line *line_queue = NULL; int displayed = 0; - GList *item_queue = NULL; - int item_queue_count = 0; + int line_queue_count = 0; if (!sym->source) lookup_sym_in_vmlinux(sym); @@ -947,30 +925,29 @@ static void show_details(struct sym_entry *sym) printf("Showing details for %s\n", sym->sym); - item = sym->source; - while (item) { - line = item->data; + line = sym->source; + while (line) { if (displayed && strstr(line->line, ">:")) break; - if (!item_queue_count) - item_queue = item; - item_queue_count ++; + if (!line_queue_count) + line_queue = line; + line_queue_count ++; if (line->count >= count_filter) { - show_lines(item_queue, item_queue_count); - item_queue_count = 0; - item_queue = NULL; - } else if (item_queue_count > TRACE_COUNT) { - item_queue = g_list_next(item_queue); - item_queue_count --; + show_lines(line_queue, line_queue_count); + line_queue_count = 0; + line_queue = NULL; + } else if (line_queue_count > TRACE_COUNT) { + line_queue = line_queue->next; + line_queue_count --; } line->count = 0; displayed++; if (displayed > 300) break; - item = g_list_next(item); + line = line->next; } } @@ -1201,6 +1178,10 @@ int main(int argc, char *argv[]) if (tid != -1 || profile_cpu != -1) nr_cpus = 1; + parse_symbols(); + if (vmlinux && sym_filter_entry) + parse_vmlinux(vmlinux); + for (i = 0; i < nr_cpus; i++) { group_fd = -1; for (counter = 0; counter < nr_counters; counter++) { @@ -1216,15 +1197,16 @@ int main(int argc, char *argv[]) hw_event.nmi = nmi; fd[i][counter] = sys_perf_counter_open(&hw_event, tid, cpu, group_fd, 0); - fcntl(fd[i][counter], F_SETFL, O_NONBLOCK); if (fd[i][counter] < 0) { + int err = errno; printf("kerneltop error: syscall returned with %d (%s)\n", - fd[i][counter], strerror(-fd[i][counter])); - if (fd[i][counter] == -1) + fd[i][counter], strerror(err)); + if (err == EPERM) printf("Are you root?\n"); exit(-1); } assert(fd[i][counter] >= 0); + fcntl(fd[i][counter], F_SETFL, O_NONBLOCK); /* * First counter acts as the group leader: @@ -1248,10 +1230,6 @@ int main(int argc, char *argv[]) } } - parse_symbols(); - if (vmlinux && sym_filter_entry) - parse_vmlinux(vmlinux); - printf("KernelTop refresh period: %d seconds\n", delay_secs); last_refresh = time(NULL);