diff options
| author | Uladzislau Rezki (Sony) <[email protected]> | 2021-09-02 21:57:16 +0000 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2021-09-03 16:58:14 +0000 |
| commit | 343ab8178f318b6006d54865972ff9c433b29e10 (patch) | |
| tree | 79777182053073e5c580bfc5293da7f22a32e49f /lib/test_vmalloc.c | |
| parent | mm/sparse: clarify pgdat_to_phys (diff) | |
| download | kernel-343ab8178f318b6006d54865972ff9c433b29e10.tar.gz kernel-343ab8178f318b6006d54865972ff9c433b29e10.zip | |
mm/vmalloc: use batched page requests in bulk-allocator
In case of simultaneous vmalloc allocations, for example it is 1GB and 12
CPUs my system is able to hit "BUG: soft lockup" for !CONFIG_PREEMPT
kernel.
RIP: 0010:__alloc_pages_bulk+0xa9f/0xbb0
Call Trace:
__vmalloc_node_range+0x11c/0x2d0
__vmalloc_node+0x4b/0x70
fix_size_alloc_test+0x44/0x60 [test_vmalloc]
test_func+0xe7/0x1f0 [test_vmalloc]
kthread+0x11a/0x140
ret_from_fork+0x22/0x30
To address this issue invoke a bulk-allocator many times until all pages
are obtained, i.e. do batched page requests adding cond_resched()
meanwhile to reschedule. Batched value is hard-coded and is 100 pages per
call.
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Uladzislau Rezki (Sony) <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Hillf Danton <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Oleksiy Avramchenko <[email protected]>
Cc: Steven Rostedt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'lib/test_vmalloc.c')
0 files changed, 0 insertions, 0 deletions