From f7df2b1cf03af680354bd4300f48f7ea11316ce8 Mon Sep 17 00:00:00 2001 From: Zhenliang Wei Date: Fri, 5 Nov 2021 13:42:55 -0700 Subject: tools/vm/page_owner_sort.c: count and sort by mem When viewing page owner information, we may be more concerned about the total memory rather than the times of stack appears. Therefore, the following adjustments are made: 1. Added the statistics on the total number of pages. 2. Added the optional parameter "-m" to configure the program to sort by memory (total pages). The general output of page_owner is as follows: Page allocated via order XXX, ... PFN XXX ... // Detailed stack Page allocated via order XXX, ... PFN XXX ... // Detailed stack The original page_owner_sort ignores PFN rows, puts the remaining rows in buf, counts the times of buf, and finally sorts them according to the times. General output: XXX times: Page allocated via order XXX, ... // Detailed stack Now, we use regexp to extract the page order value from the buf, and count the total pages for the buf. General output: XXX times, XXX pages: Page allocated via order XXX, ... // Detailed stack By default, it is still sorted by the times of buf; If you want to sort by the pages nums of buf, use the new -m parameter. Link: https://lkml.kernel.org/r/1631678242-41033-1-git-send-email-weizhenliang@huawei.com Signed-off-by: Zhenliang Wei Cc: Tang Bin Cc: Zhang Shengju Cc: Zhenliang Wei Cc: Xiaoming Ni Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- tools/vm/page_owner_sort.c | 94 +++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 85 insertions(+), 9 deletions(-) (limited to 'tools/vm') diff --git a/tools/vm/page_owner_sort.c b/tools/vm/page_owner_sort.c index 0e75f22c9475..9ebb84a9c731 100644 --- a/tools/vm/page_owner_sort.c +++ b/tools/vm/page_owner_sort.c @@ -5,6 +5,8 @@ * Example use: * cat /sys/kernel/debug/page_owner > page_owner_full.txt * ./page_owner_sort page_owner_full.txt sorted_page_owner.txt + * Or sort by total memory: + * ./page_owner_sort -m page_owner_full.txt sorted_page_owner.txt * * See Documentation/vm/page_owner.rst */ @@ -16,14 +18,18 @@ #include #include #include +#include +#include struct block_list { char *txt; int len; int num; + int page_num; }; - +static int sort_by_memory; +static regex_t order_pattern; static struct block_list *list; static int list_size; static int max_size; @@ -59,12 +65,50 @@ static int compare_num(const void *p1, const void *p2) return l2->num - l1->num; } +static int compare_page_num(const void *p1, const void *p2) +{ + const struct block_list *l1 = p1, *l2 = p2; + + return l2->page_num - l1->page_num; +} + +static int get_page_num(char *buf) +{ + int err, val_len, order_val; + char order_str[4] = {0}; + char *endptr; + regmatch_t pmatch[2]; + + err = regexec(&order_pattern, buf, 2, pmatch, REG_NOTBOL); + if (err != 0 || pmatch[1].rm_so == -1) { + printf("no order pattern in %s\n", buf); + return 0; + } + val_len = pmatch[1].rm_eo - pmatch[1].rm_so; + if (val_len > 2) /* max_order should not exceed 2 digits */ + goto wrong_order; + + memcpy(order_str, buf + pmatch[1].rm_so, val_len); + + errno = 0; + order_val = strtol(order_str, &endptr, 10); + if (errno != 0 || endptr == order_str || *endptr != '\0') + goto wrong_order; + + return 1 << order_val; + +wrong_order: + printf("wrong order in follow buf:\n%s\n", buf); + return 0; +} + static void add_list(char *buf, int len) { if (list_size != 0 && len == list[list_size-1].len && memcmp(buf, list[list_size-1].txt, len) == 0) { list[list_size-1].num++; + list[list_size-1].page_num += get_page_num(buf); return; } if (list_size == max_size) { @@ -74,6 +118,7 @@ static void add_list(char *buf, int len) list[list_size].txt = malloc(len+1); list[list_size].len = len; list[list_size].num = 1; + list[list_size].page_num = get_page_num(buf); memcpy(list[list_size].txt, buf, len); list[list_size].txt[len] = 0; list_size++; @@ -85,6 +130,13 @@ static void add_list(char *buf, int len) #define BUF_SIZE (128 * 1024) +static void usage(void) +{ + printf("Usage: ./page_owner_sort [-m] \n" + "-m Sort by total memory. If this option is unset, sort by times\n" + ); +} + int main(int argc, char **argv) { FILE *fin, *fout; @@ -92,21 +144,39 @@ int main(int argc, char **argv) int ret, i, count; struct block_list *list2; struct stat st; + int err; + int opt; - if (argc < 3) { - printf("Usage: ./program \n"); - perror("open: "); + while ((opt = getopt(argc, argv, "m")) != -1) + switch (opt) { + case 'm': + sort_by_memory = 1; + break; + default: + usage(); + exit(1); + } + + if (optind >= (argc - 1)) { + usage(); exit(1); } - fin = fopen(argv[1], "r"); - fout = fopen(argv[2], "w"); + fin = fopen(argv[optind], "r"); + fout = fopen(argv[optind + 1], "w"); if (!fin || !fout) { - printf("Usage: ./program \n"); + usage(); perror("open: "); exit(1); } + err = regcomp(&order_pattern, "order\\s*([0-9]*),", REG_EXTENDED|REG_NEWLINE); + if (err != 0 || order_pattern.re_nsub != 1) { + printf("%s: Invalid pattern 'order\\s*([0-9]*),' code %d\n", + argv[0], err); + exit(1); + } + fstat(fileno(fin), &st); max_size = st.st_size / 100; /* hack ... */ @@ -145,13 +215,19 @@ int main(int argc, char **argv) list2[count++] = list[i]; } else { list2[count-1].num += list[i].num; + list2[count-1].page_num += list[i].page_num; } } - qsort(list2, count, sizeof(list[0]), compare_num); + if (sort_by_memory) + qsort(list2, count, sizeof(list[0]), compare_page_num); + else + qsort(list2, count, sizeof(list[0]), compare_num); for (i = 0; i < count; i++) - fprintf(fout, "%d times:\n%s\n", list2[i].num, list2[i].txt); + fprintf(fout, "%d times, %d pages:\n%s\n", + list2[i].num, list2[i].page_num, list2[i].txt); + regfree(&order_pattern); return 0; } -- cgit v1.2.3