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Upstream patch to fix performance regression in virt-builder (RHBZ#1188866). 

- Change the way Python double-build is done so we only have to
  apply patches in one place.
This commit is contained in:
Richard W.M. Jones 2015-02-04 18:58:20 +00:00
parent 7551c9b6b6
commit b865a8529b
2 changed files with 80 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
0001-builder-Fix-large-performance-regression-in-pxzcat-R.patch Normal file
View File

@ -0,0 +1,63 @@
From ff1cf989fd49cfb82db428e66034c7b2d6bebe8a Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Wed, 4 Feb 2015 13:17:40 +0000
Subject: [PATCH] builder: Fix large performance regression in pxzcat
(RHBZ#1188866).
Commit 9135129b0f6e8eb171131ea0f7d729a960b74cb3 changed
two stack buffers to pointers:
- uint8_t buf[BUFFER_SIZE];
- unsigned char outbuf[BUFFER_SIZE];
+ CLEANUP_FREE uint8_t *buf = NULL;
+ CLEANUP_FREE uint8_t *outbuf = NULL;
but we were still using sizeof buf to calculate the size of the
buffer. sizeof buf == 8 so the original code which used large buffers
for reading/writing the file changed to using 8 byte buffers.
---
builder/pxzcat-c.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/builder/pxzcat-c.c b/builder/pxzcat-c.c
index bd4c0a8..0bbd296 100644
--- a/builder/pxzcat-c.c
+++ b/builder/pxzcat-c.c
@@ -640,14 +640,14 @@ worker_thread (void *vp)
strm.next_in = NULL;
strm.avail_in = 0;
strm.next_out = outbuf;
- strm.avail_out = sizeof outbuf;
+ strm.avail_out = BUFFER_SIZE;
for (;;) {
lzma_action action = LZMA_RUN;
if (strm.avail_in == 0) {
strm.next_in = buf;
- n = pread (global->fd, buf, sizeof buf, position);
+ n = pread (global->fd, buf, BUFFER_SIZE, position);
if (n == -1) {
perror (global->filename);
return &state->status;
@@ -661,7 +661,7 @@ worker_thread (void *vp)
r = lzma_code (&strm, action);
if (strm.avail_out == 0 || r == LZMA_STREAM_END) {
- size_t wsz = sizeof outbuf - strm.avail_out;
+ size_t wsz = BUFFER_SIZE - strm.avail_out;
/* Don't write if the block is all zero, to preserve output file
* sparseness. However we have to update oposition.
@@ -675,7 +675,7 @@ worker_thread (void *vp)
oposition += wsz;
strm.next_out = outbuf;
- strm.avail_out = sizeof outbuf;
+ strm.avail_out = BUFFER_SIZE;
}
if (r == LZMA_STREAM_END)
--
2.1.0

21
libguestfs.spec
View File

@ -25,13 +25,16 @@ Summary: Access and modify virtual machine disk images
Name: libguestfs
Epoch: 1
Version: 1.29.24
Release: 1%{?dist}
Release: 2%{?dist}
License: LGPLv2+
# Source and patches.
URL: http://libguestfs.org/
Source0: http://libguestfs.org/download/1.29-development/%{name}-%{version}.tar.gz
# Upstream patch to fix performance regression in virt-builder (RHBZ#1188866).
Patch0001: 0001-builder-Fix-large-performance-regression-in-pxzcat-R.patch
# Basic build requirements:
BuildRequires: perl(Pod::Simple)
BuildRequires: perl(Pod::Man)
@ -746,13 +749,18 @@ for %{name}.
%prep
%setup -q
%patch0001 -p1
# For Python 3 we must build libguestfs twice. This creates:
# %{name}-%{version}/
# %{name}-%{version}/python3/
# with a second copy of the sources in the python3 subdir.
%setup -q
%setup -q -T -D -a 0
mv %{name}-%{version} python3
pushd ..
cp -a %{name}-%{version} tmp-python3
mv tmp-python3 %{name}-%{version}/python3
popd
if [ "$(getenforce | tr '[A-Z]' '[a-z]')" != "disabled" ]; then
# For sVirt to work, the local temporary directory we use in the
@ -1283,6 +1291,11 @@ popd
%changelog
* Wed Feb 04 2015 Richard W.M. Jones <rjones@redhat.com> - 1:1.29.24-2
- Upstream patch to fix performance regression in virt-builder (RHBZ#1188866).
- Change the way Python double-build is done so we only have to
apply patches in one place.
* Tue Feb 03 2015 Richard W.M. Jones <rjones@redhat.com> - 1:1.29.24-1
- New upstream version 1.29.24.
- Add Python 3 bindings.