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authorYang Zhong <yang.zhong@intel.com>2017-12-20 21:16:46 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2017-12-21 09:30:32 +0100
commit5a22ab71623c0fb709d49df353bdf2ec7c445c4c (patch)
tree291556c8f9de0574891260e025bbefe7f18baddd /po
parent6b012d2311e5ba0a952c2dcfe4327a73353c9fdb (diff)
rcu: reduce more than 7MB heap memory by malloc_trim()
Since there are some issues in memory alloc/free machenism in glibc for little chunk memory, if Qemu frequently alloc/free little chunk memory, the glibc doesn't alloc little chunk memory from free list of glibc and still allocate from OS, which make the heap size bigger and bigger. This patch introduce malloc_trim(), which will free heap memory when there is no rcu call during rcu thread loop. malloc_trim() can be enabled/disabled by --enable-malloc-trim/ --disable-malloc-trim in the Qemu configure command. The default malloc_trim() is enabled for libc. Below are test results from smaps file. (1)without patch 55f0783e1000-55f07992a000 rw-p 00000000 00:00 0 [heap] Size: 21796 kB Rss: 14260 kB Pss: 14260 kB (2)with patch 55cc5fadf000-55cc61008000 rw-p 00000000 00:00 0 [heap] Size: 21668 kB Rss: 6940 kB Pss: 6940 kB Signed-off-by: Yang Zhong <yang.zhong@intel.com> Message-Id: <1513775806-19779-1-git-send-email-yang.zhong@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'po')
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