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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.
This commit is contained in:
Auke Kok 2012-06-05 13:32:20 -07:00 committed by Kay Sievers
parent 3cbd5f6be1
commit cae544bcdb
5 changed files with 154 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Makefile.am
View File

@ -2402,13 +2402,18 @@ systemd_readahead_collect_LDADD = \
systemd_readahead_replay_SOURCES = \
src/readahead/readahead-replay.c \
src/readahead/readahead-common.c
src/readahead/readahead-common.c \
src/readahead/readahead-common.h
systemd_readahead_replay_LDADD = \
libsystemd-shared.la \
libsystemd-daemon.la \
libudev.la
systemd_readahead_analyze_SOURCES = \
src/readahead/readahead-analyze.c \
src/readahead/readahead-common.h
pkginclude_HEADERS += \
src/systemd/sd-readahead.h
@ -2416,6 +2421,9 @@ rootlibexec_PROGRAMS += \
systemd-readahead-collect \
systemd-readahead-replay
bin_PROGRAMS += \
systemd-readahead-analyze
dist_systemunit_DATA += \
units/systemd-readahead-drop.service \
units/systemd-readahead-done.timer

141
src/readahead/readahead-analyze.c Normal file
View File

@ -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);
}

2
src/readahead/readahead-collect.c
View File

@ -493,7 +493,7 @@ done:
goto finish;
}
fputs(CANONICAL_HOST ";VERSION=2\n", pack);
fputs(CANONICAL_HOST READAHEAD_PACK_FILE_VERSION, pack);
putc(on_ssd ? 'S' : 'R', pack);
if (on_ssd || on_btrfs) {

2
src/readahead/readahead-common.h
View File

@ -29,6 +29,8 @@
#define READAHEAD_FILE_SIZE_MAX (10*1024*1024)
#define READAHEAD_PACK_FILE_VERSION ";VERSION=2\n"
int file_verify(int fd, const char *fn, off_t file_size_max, struct stat *st);
int fs_on_ssd(const char *p);

2
src/readahead/readahead-replay.c
View File

@ -183,7 +183,7 @@ static int replay(const char *root) {
char_array_0(line);
if (!streq(line, CANONICAL_HOST ";VERSION=2\n")) {
if (!streq(line, CANONICAL_HOST READAHEAD_PACK_FILE_VERSION)) {
log_debug("Pack file host or version type mismatch.");
goto finish;
}