readahead: Add tool to analyze the contents of the pack file. v3.

[elogind.git] / src / readahead / readahead-analyze.c

diff --git a/src/readahead/readahead-analyze.c b/src/readahead/readahead-analyze.c
new file mode 100644 (file)
index 0000000..6ee3551
--- /dev/null
+++ b/src/readahead/readahead-analyze.c
@@ -0,0 +1,141 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2012 Auke Kok <auke-jan.h.kok@intel.com>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <linux/limits.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+
+#include "readahead-common.h"
+
+
+int main(int argc, char *argv[])
+{
+        char line[1024];
+        char path[PATH_MAX];
+        FILE *pack;
+        int a;
+        int missing = 0;
+        off_t size;
+        long tsize = 0;
+        uint64_t inode;
+        uint32_t b;
+        uint32_t c;
+        struct stat st;
+        int pagesize = getpagesize();
+
+        if (argc != 2)
+                snprintf(path, PATH_MAX, "/.readahead");
+        else
+                snprintf(path, PATH_MAX, "%s", argv[1]);
+
+        pack = fopen(path, "r");
+        if (!pack) {
+                fprintf(stderr, "Pack file missing\n");
+                exit(EXIT_FAILURE);
+        }
+
+        if (!(fgets(line, sizeof(line), pack))) {
+                fprintf(stderr, "Pack file corrupt\n");
+                exit(EXIT_FAILURE);
+        }
+
+        if (!strstr(line, READAHEAD_PACK_FILE_VERSION)) {
+                fprintf(stderr, "Pack file version incompatible with this parser\n");
+                exit(EXIT_FAILURE);
+        }
+
+        if ((a = getc(pack)) == EOF) {
+                fprintf(stderr, "Pack file corrupt\n");
+                exit(EXIT_FAILURE);
+        }
+
+        fprintf(stdout, "   pct  sections     size: path\n");
+        fprintf(stdout, "   ===  ========     ====: ====\n");
+
+        while(true) {
+                int pages = 0;
+                int sections = 0;
+
+                if (!fgets(path, sizeof(path), pack))
+                        break; /* done */
+
+                path[strlen(path)-1] = 0;
+
+                if (fread(&inode, sizeof(inode), 1, pack) != 1) {
+                        fprintf(stderr, "Pack file corrupt\n");
+                        exit(EXIT_FAILURE);
+                }
+
+                while (true) {
+                        if (fread(&b, sizeof(b), 1, pack) != 1  ||
+                            fread(&c, sizeof(c), 1, pack) != 1) {
+                                fprintf(stderr, "Pack file corrupt\n");
+                                exit(EXIT_FAILURE);
+                        }
+                        if ((b == 0) && (c == 0))
+                                break;
+
+                        /* Uncomment this to get all the chunks separately
+                        fprintf(stdout, " %d: %d %d\n", sections, b, c);
+                         */
+
+                        pages += (c - b);
+                        sections++;
+                }
+
+                if (stat(path, &st) == 0) {
+                        if (sections == 0)
+                                size = st.st_size;
+                        else
+                                size = pages * pagesize;
+
+                        tsize += size;
+
+                        fprintf(stdout, "  %4d%% (%2d) %12ld: %s\n",
+                                sections ? (int)(size / st.st_size * 100.0) : 100,
+                                sections ? sections : 1,
+                                (unsigned long)size,
+                                path);
+                } else {
+                        fprintf(stdout, "  %4dp (%2d) %12s: %s (MISSING)\n",
+                                sections ? pages : -1,
+                                sections ? sections : 1,
+                                "???",
+                                path);
+                        missing++;
+                }
+
+        }
+
+        fprintf(stdout, "\nHOST:    %s", line);
+        fprintf(stdout, "TYPE:    %c\n", a);
+        fprintf(stdout, "MISSING: %d\n", missing);
+        fprintf(stdout, "TOTAL:   %ld\n", tsize);
+
+        exit(EXIT_SUCCESS);
+}