rpm: handle virtual memory usage when limit is set

Fix the situation where the task do_package_write_rpm ends up in
"liblzma: memory allocation failed". This happens if the host
environment has set a limit on virtual_memory for the user with
'ulimit -v' for packages with a lot of binary packages, e.g. glibc-locale.

(From OE-Core rev: a937cff2746073d1dea37d85e7305d8d6705ff28)

Signed-off-by: Peter Bergin <peter@berginkonsult.se>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 66 insertions, 0 deletions

diff --git a/meta/recipes-devtools/rpm/files/0001-rpm-rpmio.c-restrict-virtual-memory-usage-if-limit-s.patch b/meta/recipes-devtools/rpm/files/0001-rpm-rpmio.c-restrict-virtual-memory-usage-if-limit-s.patch
new file mode 100644
index 0000000000..6454785254
--- /dev/null
+++ b/meta/recipes-devtools/rpm/files/0001-rpm-rpmio.c-restrict-virtual-memory-usage-if-limit-s.patch
@@ -0,0 +1,65 @@
+From 0066b862bb3a09f39295abd5d972a53ac8dc1555 Mon Sep 17 00:00:00 2001
+From: Peter Bergin <peter@berginkonsult.se>
+Date: Wed, 19 Sep 2018 15:12:31 +0200
+Subject: [PATCH] rpm/rpmio.c: restrict virtual memory usage if limit set
+
+A solution to avoid OOM situation when the virtual memory is restricted
+for a user (ulimit -v). As the lzopen_internal function is run in parallel
+one instance per CPU thread the available virtual memory is limited per
+CPU thread.
+
+Upstream-Status: Pending [merge of multithreading patches to upstream]
+
+Signed-off-by: Peter Bergin <peter@berginkonsult.se>
+---
+ rpmio/rpmio.c | 34 ++++++++++++++++++++++++++++++++++
+ 1 file changed, 34 insertions(+)
+
+diff --git a/rpmio/rpmio.c b/rpmio/rpmio.c
+index e051c98..b3c56b6 100644
+--- a/rpmio/rpmio.c
++++ b/rpmio/rpmio.c
+@@ -845,6 +845,40 @@ static LZFILE *lzopen_internal(const char *mode, int fd, int xz)
+                }
+ #endif
+ 
++               struct rlimit virtual_memory;
++               getrlimit(RLIMIT_AS, &virtual_memory);
++               if (virtual_memory.rlim_cur != RLIM_INFINITY) {
++                       const uint64_t virtual_memlimit = virtual_memory.rlim_cur;
++                       const uint64_t virtual_memlimit_per_cpu_thread =
++                               virtual_memlimit / lzma_cputhreads();
++                       uint64_t memory_usage_virt;
++                       rpmlog(RPMLOG_NOTICE, "XZ: virtual memory restricted to %lu and "
++                              "per CPU thread %lu\n", virtual_memlimit, virtual_memlimit_per_cpu_thread);
++                       /* keep reducing the number of compression threads until memory
++                          usage falls below the limit per CPU thread*/
++                       while ((memory_usage_virt = lzma_stream_encoder_mt_memusage(&mt_options)) >
++                              virtual_memlimit_per_cpu_thread) {
++                               /* If number of threads goes down to zero lzma_stream_encoder will
++                                * will return UINT64_MAX. We must check here to avoid an infinite loop.
++                                * If we get into situation that one thread requires more virtual memory
++                                * than available we set one thread, print error message and try anyway. */
++                               if (--mt_options.threads == 0) {
++                                       mt_options.threads = 1;
++                                       rpmlog(RPMLOG_WARNING,
++                                              "XZ: Could not adjust number of threads to get below "
++                                              "virtual memory limit %lu. usage %lu\n",
++                                              virtual_memlimit_per_cpu_thread, memory_usage_virt);
++                                       break;
++                               }
++                       }
++                       if (threads != (int)mt_options.threads)
++                               rpmlog(RPMLOG_NOTICE,
++                                      "XZ: Adjusted the number of threads from %d to %d to not "
++                                      "exceed the memory usage limit of %lu bytes\n",
++                                      threads, mt_options.threads, virtual_memlimit);
++
++               }
++
+                ret = lzma_stream_encoder_mt(&lzfile->strm, &mt_options);
+            }
+ #endif
+-- 
+2.7.4
+
diff --git a/meta/recipes-devtools/rpm/rpm_4.14.2.bb b/meta/recipes-devtools/rpm/rpm_4.14.2.bb
index 46f88375ff..200fe4da26 100644
--- a/meta/recipes-devtools/rpm/rpm_4.14.2.bb
+++ b/meta/recipes-devtools/rpm/rpm_4.14.2.bb
@@ -39,6 +39,7 @@ SRC_URI = "git://github.com/rpm-software-management/rpm;branch=rpm-4.14.x \
            file://0003-rpmstrpool.c-make-operations-over-string-pools-threa.patch \
            file://0004-build-pack.c-remove-static-local-variables-from-buil.patch \
            file://0001-perl-disable-auto-reqs.patch \
+           file://0001-rpm-rpmio.c-restrict-virtual-memory-usage-if-limit-s.patch \
            "
 
 PE = "1"