[pve-devel] [PATCH-SERIES qemu, qemu-server, manager 0/1] add tcmalloc support

[Alexandre Derumier <aderumier@odiso.com>]

This patches series add support for tcmalloc allocator with a new optionnal
tuning option in qemu-server.

tcmalloc improve librbd performance by 30% in latency and iops.

some performance bench results:

malloc: 60k iops 4k randread
tcmalloc : 90k iops 4k randread


a qemu patch is provided, to detect if a different memory allocator than
glibc malloc is loaded through LD_PRELOAD, to avoid the call of malloc_trim().
I don't have seen crash without this patch, but it's safer with it,
and as it's called 3-4x by second, it'll avoid some unnecessary calls.

qemu:

Alexandre Derumier (1):
  add patch: add memory allocator detection and use malloc_trim for
    glibc only

 ...-and-call-malloc_trim-only-for-glibc.patch | 163 ++++++++++++++++++
 debian/patches/series                         |   1 +
 2 files changed, 164 insertions(+)
 create mode 100644 debian/patches/pve/0063-detect-allocator-and-call-malloc_trim-only-for-glibc.patch

qemu-server:

Alexandre Derumier (1):
  qemu options: add tuning allocator

 PVE/QemuServer.pm | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

pve-manager:

Alexandre Derumier (1):
  ui: qemu : add tuning option

-- 
2.30.2