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authorEric Wong <normalperson@yhbt.net>2008-10-24 18:41:26 -0700
committerEric Wong <normalperson@yhbt.net>2008-10-24 18:41:26 -0700
commite69018abd4d720324992d4fe276da8405182c108 (patch)
tree5cb36cbf7fd79a79a00fcf842290e3c9b02d47b4
downloadpcu-e69018abd4d720324992d4fe276da8405182c108.tar.gz
initial v0.1.0
-rw-r--r--.gitignore4
-rw-r--r--COPYING340
-rwxr-xr-xGIT-VERSION-GEN40
-rw-r--r--Makefile34
-rw-r--r--README15
-rw-r--r--compat-util.h40
-rw-r--r--fadvise.c102
-rw-r--r--mincore.c63
8 files changed, 638 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..913367e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+pcu-mincore
+pcu-fadvise
+*.tar.gz
+GIT-VERSION-FILE
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..5b6e7c6
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,340 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
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+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
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+
+  Finally, any free program is threatened constantly by software
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+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
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+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
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+  2. You may modify your copy or copies of the Program or any portion
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+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
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+
+    c) If the modified program normally reads commands interactively
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+
+These requirements apply to the modified work as a whole.  If
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+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
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+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
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+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
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+
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+distribute the Program or its derivative works.  These actions are
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+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
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+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
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+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
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+
+It is not the purpose of this section to induce you to infringe any
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+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
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+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.
diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
new file mode 100755
index 0000000..4e7f0e3
--- /dev/null
+++ b/GIT-VERSION-GEN
@@ -0,0 +1,40 @@
+#!/bin/sh
+
+GVF=GIT-VERSION-FILE
+DEF_VER=v0.1.0.GIT
+
+LF='
+'
+
+# First see if there is a version file (included in release tarballs),
+# then try git-describe, then default.
+if test -f version
+then
+        VN=$(cat version) || VN="$DEF_VER"
+elif test -d .git -o -f .git &&
+        VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
+        case "$VN" in
+        *$LF*) (exit 1) ;;
+        v[0-9]*)
+                git update-index -q --refresh
+                test -z "$(git diff-index --name-only HEAD --)" ||
+                VN="$VN-dirty" ;;
+        esac
+then
+        VN=$(echo "$VN" | sed -e 's/-/./g');
+else
+        VN="$DEF_VER"
+fi
+
+VN=$(expr "$VN" : v*'\(.*\)')
+
+if test -r $GVF
+then
+        VC=$(sed -e 's/^GIT_VERSION = //' <$GVF)
+else
+        VC=unset
+fi
+test "$VN" = "$VC" || {
+        echo >&2 "GIT_VERSION = $VN"
+        echo "GIT_VERSION = $VN" >$GVF
+}
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..4acac90
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,34 @@
+# default target
+all::
+
+# overridable from command-line
+CFLAGS = -g -O2 -Wall
+LDFLAGS = -Wl,-O1
+
+fadvise.c: compat-util.h
+mincore.c: compat-util.h
+
+pcu-mincore: mincore.c
+pcu-fadvise: fadvise.c
+
+PCU_BIN := pcu-fadvise pcu-mincore
+
+$(PCU_BIN):
+        $(CC) $(CFLAGS) $(LDFLAGS) -o $@+ $<
+        mv $@+ $@
+
+all:: $(PCU_BIN)
+
+GIT-VERSION-FILE: .FORCE-GIT-VERSION-FILE
+        @./GIT-VERSION-GEN
+-include GIT-VERSION-FILE
+
+DISTNAME = pcu-$(GIT_VERSION)
+dist: GIT-VERSION-FILE
+        git archive --format=tar --prefix=$(DISTNAME)/ HEAD^{tree} \
+                | gzip -9 > $(DISTNAME).tar.gz+
+        mv $(DISTNAME).tar.gz+ $(DISTNAME).tar.gz
+clean:
+        $(RM) $(PCU_BIN) $(DISTNAME).tar.gz*
+
+.PHONY: .FORCE-GIT-VERSION-FILE
diff --git a/README b/README
new file mode 100644
index 0000000..3e73b72
--- /dev/null
+++ b/README
@@ -0,0 +1,15 @@
+command-line utils for viewing/managing the Linux page cache
+
+pcu-mincore - shows the pages in the page cache for given files
+
+        pcu-mincore <files>
+
+
+pcu-fadvise - runs posix_fadvise(2) on a given file
+
+        pcu-fadvise [-a advice] [-o offset] [-l length] <files>
+
+        advice can be one of:
+          normal, sequential, random, noreuse, willneed, dontneed
+
+See posix_fadvise(2) and mincore(2) manpages for more details.
diff --git a/compat-util.h b/compat-util.h
new file mode 100644
index 0000000..60c4081
--- /dev/null
+++ b/compat-util.h
@@ -0,0 +1,40 @@
+#ifndef OS_COMPAT_H
+#define OS_COMPAT_H
+
+#define _LARGE_FILES
+#define _FILE_OFFSET_BITS 64
+#define _BSD_SOURCE /* for mincore */
+#define _XOPEN_SOURCE 600 /* for posix_fadvise */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <assert.h>
+
+#ifndef O_NOATIME
+#  define O_NOATIME 0
+#endif /* O_NOATIME */
+
+#define PAGE_MASK               (~(page_size() -1))
+#define PAGE_ALIGN(addr)        (((addr) + page_size() - 1) & PAGE_MASK)
+#define PAGE_ALIGN_DOWN(addr) \
+        (addr > page_size() ? PAGE_ALIGN(addr) - page_size() : 0)
+
+static inline size_t page_size(void)
+{
+        static size_t size;
+
+        if (!size)
+                size = sysconf(_SC_PAGESIZE);
+
+        return size;
+}
+
+#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
+
+#endif /* OS_COMPAT_H */
diff --git a/fadvise.c b/fadvise.c
new file mode 100644
index 0000000..c2392f4
--- /dev/null
+++ b/fadvise.c
@@ -0,0 +1,102 @@
+#include "compat-util.h"
+
+static struct fa_advice {
+        const char *name;
+        const int nr;
+} advice_table[] = {
+        { "normal", POSIX_FADV_NORMAL },
+        { "sequential", POSIX_FADV_SEQUENTIAL },
+        { "random", POSIX_FADV_RANDOM },
+        { "noreuse", POSIX_FADV_NOREUSE },
+        { "willneed", POSIX_FADV_WILLNEED },
+        { "dontneed" , POSIX_FADV_DONTNEED }
+};
+
+static void apply_fadvise(const char *path, off_t offset, off_t len, int advice)
+{
+        int fd;
+
+        if ((fd = open(path, O_RDONLY)) < 0) {
+                fprintf(stderr, "%s: open(): %s\n", path, strerror(errno));
+                return;
+        }
+
+        if (len <= 0) {
+                /* for compatibility with kernels < 2.6.6 */
+                struct stat sb;
+
+                if (fstat(fd, &sb) < 0) {
+                        fprintf(stderr, "%s: fstat(%d): %s\n",
+                                path, fd, strerror(errno));
+                        goto out;
+                }
+                len = sb.st_size;
+        }
+
+        if (posix_fadvise(fd, offset, len, advice) < 0)
+                fprintf(stderr,
+                        "%s: posix_fadvise("
+                        "offset=%lu,len=%lu,advice=%d): %s\n",
+                        path,
+                        (unsigned long)offset,
+                        (unsigned long)len,
+                        advice, strerror(errno));
+
+out:
+        close(fd);
+}
+
+int main(int argc, char * const argv[])
+{
+        off_t offset = 0;
+        off_t len = 0;
+        int advice = POSIX_FADV_NORMAL;
+        int opt;
+        int argi = 1;
+
+        while ((opt = getopt(argc, argv, "o:l:a:")) != -1) {
+                int i;
+                char *err;
+
+                argi += 2;
+                switch(opt) {
+                case 'o':
+                        offset = strtol(optarg, &err, 10);
+                        if (*err || offset < 0) {
+                                fprintf(stderr, "offset must be >= 0\n");
+                                return 1;
+                        }
+                        break;
+                case 'l':
+                        len = strtol(optarg, &err, 10);
+                        if (*err || len < 0) {
+                                fprintf(stderr, "length must be >= 0\n");
+                                return 1;
+                        }
+                        break;
+                case 'a':
+                        for (i = 0; i < ARRAY_SIZE(advice_table); ++i) {
+                                if (strcmp(advice_table[i].name, optarg))
+                                        continue;
+                                advice = advice_table[i].nr;
+                                break;
+                        }
+                        if (i < ARRAY_SIZE(advice_table))
+                                break;
+                        fprintf(stderr, "advice '%s' not understood\n", optarg);
+                        /* fall-through */
+                default:
+                        fprintf(stderr,
+                                "Usage: %s [-a advice] [-o offset] "
+                                "[-l length] <files>\n", argv[0]);
+                        fprintf(stderr, "\nPossible values for advice:\n");
+                        for (i = 0; i < ARRAY_SIZE(advice_table); ++i)
+                                fprintf(stderr, "\t%s\n", advice_table[i].name);
+                        return 1;
+                }
+        }
+
+        for (; argi < argc; ++argi)
+                apply_fadvise(argv[argi], offset, len, advice);
+        return 0;
+}
diff --git a/mincore.c b/mincore.c
new file mode 100644
index 0000000..3309bd9
--- /dev/null
+++ b/mincore.c
@@ -0,0 +1,63 @@
+#include "compat-util.h"
+
+static void mincore_stats(const char *path)
+{
+        struct stat sb;
+        char *map;
+        unsigned char *vec;
+        size_t vec_len;
+        size_t map_len;
+        int fd;
+        size_t i;
+
+        if ((fd = open(path, O_RDONLY)) < 0) {
+                fprintf(stderr, "%s: open(): %s\n", path, strerror(errno));
+                return;
+        }
+
+        if (fstat(fd, &sb) < 0) {
+                fprintf(stderr, "%s: fstat(%d): %s\n",
+                        path, fd, strerror(errno));
+                goto err_close;
+        }
+
+        vec_len = (sb.st_size + page_size() - 1) / page_size();
+        if (!(vec = malloc(vec_len))) {
+                fprintf(stderr, "%s: malloc(%lu): %s\n",
+                        path, (unsigned long)vec_len, strerror(errno));
+                goto err_close;
+        }
+
+        map_len = PAGE_ALIGN(sb.st_size);
+        if (!(map = mmap(NULL, map_len, PROT_READ, MAP_SHARED, fd, 0))) {
+                fprintf(stderr, "%s: mmap(%lu): %s\n",
+                        path, (unsigned long)vec_len, strerror(errno));
+                goto err_free;
+        }
+
+        if (mincore(map, map_len, vec) < 0) {
+                fprintf(stderr, "%s: mincore(%lu): %s\n",
+                        path, (unsigned long)vec_len, strerror(errno));
+                goto err_munmap;
+        }
+
+        for (i = 0; i < vec_len; ++i)
+                printf("%s: [%08lu] %x\n",
+                       path, (unsigned long)i,
+                       (vec[i]));
+err_munmap:
+        munmap(map, map_len);
+err_free:
+        free(vec);
+err_close:
+        close(fd);
+}
+
+int main(int argc, char * const argv[])
+{
+        int i;
+
+        for (i = 1; i < argc; ++i)
+                mincore_stats(argv[i]);
+        return 0;
+}