From cae544bcdb073134bcaa2031aeb1f1705030046e Mon Sep 17 00:00:00 2001 From: Auke Kok Date: Tue, 5 Jun 2012 13:32:20 -0700 Subject: readahead: Add tool to analyze the contents of the pack file. v3. This patch adds code to compile 'systemd-readahead-analyze' and install it into $bindir. Use this program to parse the contents of the readahead pack file, or an arbitrary pack file and display which files are listed in it, and how much of the files are requested to be readahead. This code is not new - it's partially taken from sreadahead (formerly maintained by Arjan van der Ven and me, and was originally written by me), and adapted with the right bits to parse the systemd readahead pack files, which are slightly different in format. v2 adds a common READAHEAD_PACK_FILE_VERSION used in all the code to provide a quick way to assure all these programs are always synchronized. v3 fixes the integer math. --- src/readahead/readahead-analyze.c | 141 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 141 insertions(+) create mode 100644 src/readahead/readahead-analyze.c (limited to 'src/readahead/readahead-analyze.c') diff --git a/src/readahead/readahead-analyze.c b/src/readahead/readahead-analyze.c new file mode 100644 index 0000000000..6ee355146a --- /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 + + 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 . +***/ + + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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); +} -- cgit v1.2.3