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  1. 18 10月, 2015 4 次提交
  3. 25 9月, 2015 2 次提交
  5. 21 9月, 2015 2 次提交
  7. 16 9月, 2015 1 次提交
  9. 12 9月, 2015 1 次提交
  11. 11 9月, 2015 13 次提交
  13. 09 9月, 2015 1 次提交
  15. 05 9月, 2015 6 次提交
  17. 04 9月, 2015 3 次提交
  19. 28 8月, 2015 2 次提交
    • R
      scripts: add stackdelta script · 5bbb9f75
      由 Rasmus Villemoes 提交于 
      This adds a simple perl script for reading two files as produced by
the stackusage script and computing the changes in stack usage. For
example:

$ scripts/stackusage -o /tmp/old.su CC=gcc-4.7 -j8 fs/ext4/
$ scripts/stackusage -o /tmp/new.su CC=gcc-5.0 -j8 fs/ext4/
$ scripts/stackdelta /tmp/{old,new}.su | sort -k5,5g

shows that gcc 5.0 generally produces less stack-hungry code than gcc
4.7. Obviously, the script can also be used for measuring the effect
of commits, .config tweaks or whatnot.
Signed-off-by: NRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: NMichal Marek <mmarek@suse.com>
      5bbb9f75
    • R
      scripts: add stackusage script · 56d4a381
      由 Rasmus Villemoes 提交于 
      The current checkstack.pl script has a few problems, stemming from the
overly simplistic attempt at parsing objdump output with regular
expressions: For example, on x86_64 it doesn't take the push
instruction into account, making it consistently underestimate the
real stack use, and it also doesn't capture stack pointer adjustments
of exactly 128 bytes [1].

Since newer gcc (>= 4.6) knows about -fstack-usage, we might as well
take the information straight from the horse's mouth. This patch
introduces scripts/stackusage, which is a simple wrapper for running
make with KCFLAGS set to -fstack-usage. Example use is

scripts/stackusage -o out.su -j8 lib/

The script understands "-o foo" for writing to 'foo' and -h for a
trivial help text; anything else is passed to make.

Afterwards, we find all newly created .su files, massage them a
little, sort by stack use and write the result to a single output
file.

Note that the function names printed by (at least) gcc 4.7 are
sometimes useless. For example, the first three lines of out.su
generated above are

./lib/decompress_bunzip2.c:155  get_next_block  448     static
./lib/decompress_unlzma.c:537   unlzma  336     static
./lib/vsprintf.c:616    8       304     static

That function '8' is really the static symbol_string(), but it has
been subject to 'interprocedural scalar replacement of aggregates', so
its name in the object file is 'symbol_string.isra.8'. gcc 5.0 doesn't
have this problem; it uses the full name as seen in the object file.

[1] Since gcc encodes that by

48 83 c4 80             add    $0xffffffffffffff80,%rsp

and not

48 81 ec 80 00 00 00    sub    $0x80,%rsp

since -128 fits in an imm8.
Signed-off-by: NRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: NMichal Marek <mmarek@suse.com>
      56d4a381
  21. 27 8月, 2015 1 次提交
  23. 26 8月, 2015 1 次提交
  25. 24 8月, 2015 3 次提交