[PATCH v2] scripts/ksize: Add kernel build size report

[Darren Hart]

ksize generates hierarchical build size reports from vmlinux, *.o, and
built-in.o files.

ksize is useful in preparing minimal configurations and comparing
similar configurations across kernel versions.

Signed-off-by: Darren Hart <dvhart@xxxxxxxxxxxxxxx>
Reviewed-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx>

--
v2: Drop kernel version detection per feedback from Josh Triplett
---
 scripts/ksize | 340 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 340 insertions(+)
 create mode 100755 scripts/ksize

diff --git a/scripts/ksize b/scripts/ksize
new file mode 100755
index 0000000..0a52121
--- /dev/null
+++ b/scripts/ksize
@@ -0,0 +1,340 @@
+#!/usr/bin/env python
+#
+# Copyright (c) 2011-2014 Intel Corporation.
+# All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# 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.
+#
+# Author: Darren Hart <dvhart@xxxxxxxxxxxxxxx>
+#
+
+"""
+Display details of the kernel build size.
+
+The generated report is comprised of many sub-reports, starting with vmlinux,
+and descending into each component built-in.o.
+
+The first line of each report block is the table header, including the report
+title and the column labels. Next is the report totals for the top level file
+(vmlinux or built-in.o). This is followed by itemized sizes for any component
+*.o object files and all built-in.o files from one directory down (the
+built-in.o components are labeled with their parent directory to avoid
+displaying "built-in.o" on nearly every line). The final lines display the sum
+of all the itemized components and delta between the total and the sum.
+
+An example report from an x86_64 allnoconfig build follows in part:
+
+Linux Kernel (vmlinux)                  total |       text       data        bss
+--------------------------------------------------------------------------------
+vmlinux                               2201904 |     864548     121612    1215744
+--------------------------------------------------------------------------------
+arch/x86                               282709 |     171021      65448      46240
+kernel                                 249960 |     234355       7201       8404
+mm                                     190369 |     154171      14154      22044
+fs                                     163867 |     160820       1351       1696
+drivers                                 44429 |      41353       2052       1024
+lib                                     37143 |      37053         85          5
+init                                    21535 |       5189      16285         61
+security                                 3674 |       3658          8          8
+net                                       122 |        122          0          0
+--------------------------------------------------------------------------------
+sum                                    993808 |     807742     106584      79482
+delta                                 1208096 |      56806      15028    1136262
+
+...
+
+drivers                                 total |       text       data        bss
+--------------------------------------------------------------------------------
+drivers/built-in.o                      44429 |      41353       2052       1024
+--------------------------------------------------------------------------------
+drivers/base                            32427 |      31267       1060        100
+drivers/char                             9980 |       8412        656        912
+drivers/rtc                              1155 |       1155          0          0
+drivers/clocksource                       674 |        406        256         12
+drivers/video                              62 |         46         16          0
+--------------------------------------------------------------------------------
+sum                                     44298 |      41286       1988       1024
+delta                                     131 |         67         64          0
+
+The report may optionally display an additional level of drivers/* reports:
+
+    drivers/base                        total |       text       data        bss
+    ----------------------------------------------------------------------------
+    drivers/base/built-in.o             32427 |      31267       1060        100
+    ----------------------------------------------------------------------------
+    drivers/base/*.o                    32253 |      31121       1032        100
+    ----------------------------------------------------------------------------
+    sum                                 32253 |      31121       1032        100
+    delta                                 174 |        146         28          0
+
+    ...
+"""
+
+import sys
+import getopt
+import os
+import struct
+import termios
+import fcntl
+import glob
+from subprocess import *
+
+
+def usage():
+    print 'Usage: ksize [OPTION]...'
+    print '  -d,                 display an additional level of drivers detail'
+    print '  -h, --help          display this help and exit'
+    print ''
+    print 'Run ksize from the top-level Linux kernel build directory. Always'
+    print 'perform a "make clean" before running a build to be measured by'
+    print 'ksize to avoid contaminating the report with unassociated build'
+    print 'artifacts'
+
+
+def term_width():
+    """
+    Determine the width of the terminal for formatting the report
+
+    Prefer the COLUMNS environment variable, and fall back to termios.
+    The width will be limited to the range of [70, 100], and will default to 80
+    if none can be determined, or if redirecting to a file.
+    """
+    minw = 70
+    maxw = 100
+
+    if os.environ.has_key('COLUMNS'):
+        return max(minw, min(int(os.environ['COLUMNS']), maxw))
+
+    try:
+        (rows,cols) = struct.unpack('hh', fcntl.ioctl(1, termios.TIOCGWINSZ, "CCRR"))
+        return max(minw, min(cols, maxw))
+    except IOError:
+        # Probably redirecting to a file
+        pass
+    except struct.error, err:
+        print "Error:", err
+        sys.exit(1)
+
+    return 80
+
+
+def fmt_title(title, maxw):
+    """
+    Format the title to fit within a maximum width
+
+    The title will be shifted left and prefixed with a '<' character as
+    necessary to fit within the maximum width.
+
+    Args:
+      title (str): Title to be formatted
+      maxw (int): Maximum width
+    """
+    if len(title) <= maxw:
+        return title
+    else:
+        return "<%s" % (title[-(maxw - 1):])
+
+
+class Sizes(object):
+    """
+    Storage class for 'size -t' output
+    """
+    def __init__(self, title="", files=None):
+        """
+        Create a new Sizes container and populate it with the sum of the sizes
+        from the files list.
+
+        Args:
+          title (str, optional): Title to display via the show method
+          files (list of str, optional): Files to pass to 'size -t'
+        """
+        self.title = title
+        self.text = self.data = self.bss = self.total = 0
+
+        if files:
+            p = Popen("size -t " + " ".join(files),
+                      shell=True, stdout=PIPE, stderr=PIPE)
+            output = p.communicate()[0].splitlines()
+
+            if len(output) > 2:
+                sizes = output[-1].split()[0:4]
+                self.text = int(sizes[0])
+                self.data = int(sizes[1])
+                self.bss = int(sizes[2])
+                self.total = int(sizes[3])
+
+    def __add__(self, that):
+        if not (isinstance(self, Sizes) and isinstance(that, Sizes)):
+            raise TypeError
+        sum = Sizes()
+        sum.text = self.text + that.text
+        sum.data = self.data + that.data
+        sum.bss = self.bss + that.bss
+        sum.total = self.total + that.total
+        return sum
+
+    def __sub__(self, that):
+        if not (isinstance(self, Sizes) and isinstance(that, Sizes)):
+            raise TypeError
+        diff = Sizes()
+        diff.text = self.text - that.text
+        diff.data = self.data - that.data
+        diff.bss = self.bss - that.bss
+        diff.total = self.total - that.total
+        return diff
+
+    def show(self, cols, indent="", alt_title=None):
+        """
+        Print a row in a report for sizes represented by this object
+
+        Args:
+          cols (int): Width of the report in characters
+          indent (str, optional): Literal indentation string, all spaces
+          alt_title (str, optional): An alternate title to display
+        """
+        max_title = cols - 46 - len(indent)
+        if alt_title is not None:
+            title = fmt_title(alt_title, max_title)
+        else:
+            title = fmt_title(self.title, max_title)
+        print "%s%-*s %10d | %10d %10d %10d" % (
+                indent, max_title, title, self.total,
+                self.text, self.data, self.bss)
+
+
+class Report(object):
+    """
+    Container of sizes and sub reports
+    """
+    @staticmethod
+    def create(title, filename, subglobs):
+        """
+        Named constructor to create hierarchies of Report objects
+
+        Args:
+          title (str): Title of the report
+          filename (str): Top level build object filename
+          subglobs (list of str): Shell globs matching the components of the top
+            level filename
+        """
+        r = Report(title, [filename])
+
+        # Create the .o object file report for this level
+        path = os.path.dirname(filename)
+        files = [p for p in glob.iglob(path + "/*.o") if not p.endswith("/built-in.o")]
+        r.parts.append(Report(path + "/*.o", files))
+
+        # Create the sub-reports based on each built-in.o
+        for g in subglobs:
+            for f in glob.glob(g):
+                path = os.path.dirname(f)
+                r.parts.append(Report.create(path, f, [path + "/*/built-in.o"]))
+
+        # Display in descending total size order
+        r.parts.sort(reverse=True)
+
+        # Calculate the sum and deltas from each component report
+        for b in r.parts:
+            r.totals += b.sizes
+        r.totals.title = "sum"
+
+        r.deltas = r.sizes - r.totals
+        r.deltas.title = "delta"
+
+        return r
+
+    def __init__(self, title, files):
+        """
+        Create a new singular Report object, only called by Report.create()
+
+        Args:
+          title (str, optional): Title to display via the show method
+          files (list of str, optional): Files to construct Sizes
+        """
+        self.files = files
+        self.title = title
+        self.parts = list()
+        self.sizes = Sizes(title, files)
+        self.totals = Sizes("sum")
+        self.deltas = Sizes("delta")
+
+    def show(self, cols, indent=""):
+        """
+        Print the Report as a table with Sizes as rows
+
+        Args:
+          cols (int): Width of the report in characters
+          indent (str, optional): Literal indentation string, all spaces
+        """
+        max_title = cols - 46 - len(indent)
+        title = fmt_title(self.title, max_title)
+        rule = str.ljust(indent, cols, '-')
+
+        # Print report table header
+        print "%s%-*s %10s | %10s %10s %10s" % (
+                indent, max_title, title, "total", "text", "data", "bss")
+
+        # Print top level report filename instead of title (usually path)
+        print rule
+        self.sizes.show(cols, indent, self.files[0])
+        print rule
+
+        # Print component sizes (*.o and */built-in.o)
+        for p in self.parts:
+            if p.sizes.total > 0:
+                p.sizes.show(cols, indent)
+        print rule
+
+        # Print the sum of the components, and the delta with the total
+        self.totals.show(cols, indent)
+        self.deltas.show(cols, indent)
+        print "\n"
+
+    def __cmp__(self, that):
+        if not isinstance(that, Report):
+            raise TypeError
+        return cmp(self.sizes.total, that.sizes.total)
+
+
+def main(argv):
+    try:
+        opts, args = getopt.getopt(argv[1:], "dh", ["help"])
+    except getopt.GetoptError, err:
+        print '%s' % str(err)
+        usage()
+        return 2
+
+    driver_detail = False
+    for o, a in opts:
+        if o == '-d':
+            driver_detail = True
+        elif o in ('-h', '--help'):
+            usage()
+            return 0
+        else:
+            assert False, "unhandled option"
+
+    cols = term_width()
+
+    globs = ["arch/*/built-in.o", "*/built-in.o"]
+    vmlinux = Report.create("Linux Kernel (vmlinux)", "vmlinux", globs)
+
+    vmlinux.show(cols)
+    for b in vmlinux.parts:
+        if b.totals.total > 0 and len(b.parts) > 1:
+            b.show(cols)
+        if b.title == "drivers" and driver_detail:
+            for d in b.parts:
+                if d.totals.total > 0 and len(d.parts) > 1:
+                    d.show(cols, "    ")
+
+
+if __name__ == "__main__":
+    sys.exit(main(sys.argv))
-- 
2.1.1

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