Hello!
On 7/24/2018 10:19 AM, Li RongQing wrote:
when system forks a process with CLONE_NEWNET flag under the
high memory pressure, it will trigger memory reclaim and stall
for a long time because nf_ct_alloc_hashtable need to allocate
high-order memory at that time. The calltrace as below:
delay_tsc
__delay
_raw_spin_lock
_spin_lock
mmu_shrink
shrink_slab
zone_reclaim
get_page_from_freelist
__alloc_pages_nodemask
alloc_pages_current
__get_free_pages
nf_ct_alloc_hashtable
nf_conntrack_init_net
setup_net
copy_net_ns
create_new_namespaces
copy_namespaces
copy_process
do_fork
sys_clone
stub_clone
__clone
not use the directly memory reclaim flag to avoid stall
You mean "do not use"?
Signed-off-by: Ni Xun <[email protected]>
Signed-off-by: Zhang Yu <[email protected]>
Signed-off-by: Wang Li <[email protected]>
Signed-off-by: Li RongQing <[email protected]>
[...]
MBR, Sergei
