On Fri, Mar 29, 2019 at 10:46:09AM -0700, Greg Thelen wrote:
Since commit a983b5ebee57 ("mm: memcontrol: fix excessive complexity in memory.stat reporting") memcg dirty and writeback counters are managed as:
- per-memcg per-cpu values in range of [-32..32]
- per-memcg atomic counter
When a per-cpu counter cannot fit in [-32..32] it's flushed to the atomic. Stat readers only check the atomic. Thus readers such as balance_dirty_pages() may see a nontrivial error margin: 32 pages per cpu. Assuming 100 cpus: 4k x86 page_size: 13 MiB error per memcg 64k ppc page_size: 200 MiB error per memcg Considering that dirty+writeback are used together for some decisions the errors double.
This inaccuracy can lead to undeserved oom kills. One nasty case is when all per-cpu counters hold positive values offsetting an atomic negative value (i.e. per_cpu[*]=32, atomic=n_cpu*-32). balance_dirty_pages() only consults the atomic and does not consider throttling the next n_cpu*32 dirty pages. If the file_lru is in the 13..200 MiB range then there's absolutely no dirty throttling, which burdens vmscan with only dirty+writeback pages thus resorting to oom kill.
It could be argued that tiny containers are not supported, but it's more subtle. It's the amount the space available for file lru that matters. If a container has memory.max-200MiB of non reclaimable memory, then it will also suffer such oom kills on a 100 cpu machine.
The following test reliably ooms without this patch. This patch avoids oom kills.
$ cat test mount -t cgroup2 none /dev/cgroup cd /dev/cgroup echo +io +memory > cgroup.subtree_control mkdir test cd test echo 10M > memory.max (echo $BASHPID > cgroup.procs && exec /memcg-writeback-stress /foo) (echo $BASHPID > cgroup.procs && exec dd if=/dev/zero of=/foo bs=2M count=100)
$ cat memcg-writeback-stress.c /*
- Dirty pages from all but one cpu.
- Clean pages from the non dirtying cpu.
- This is to stress per cpu counter imbalance.
- On a 100 cpu machine:
- per memcg per cpu dirty count is 32 pages for each of 99 cpus
- per memcg atomic is -99*32 pages
- thus the complete dirty limit: sum of all counters 0
- balance_dirty_pages() only sees atomic count -99*32 pages, which
- it max()s to 0.
- So a workload can dirty -99*32 pages before balance_dirty_pages()
- cares.
*/ #define _GNU_SOURCE #include <err.h> #include <fcntl.h> #include <sched.h> #include <stdlib.h> #include <stdio.h> #include <sys/stat.h> #include <sys/sysinfo.h> #include <sys/types.h> #include <unistd.h>
static char *buf; static int bufSize;
static void set_affinity(int cpu) { cpu_set_t affinity;
CPU_ZERO(&affinity); CPU_SET(cpu, &affinity); if (sched_setaffinity(0, sizeof(affinity), &affinity)) err(1, "sched_setaffinity"); }
static void dirty_on(int output_fd, int cpu) { int i, wrote;
set_affinity(cpu); for (i = 0; i < 32; i++) { for (wrote = 0; wrote < bufSize; ) { int ret = write(output_fd, buf+wrote, bufSize-wrote); if (ret == -1) err(1, "write"); wrote += ret; } } }
int main(int argc, char **argv) { int cpu, flush_cpu = 1, output_fd; const char *output;
if (argc != 2) errx(1, "usage: output_file");
output = argv[1]; bufSize = getpagesize(); buf = malloc(getpagesize()); if (buf == NULL) errx(1, "malloc failed");
output_fd = open(output, O_CREAT|O_RDWR); if (output_fd == -1) err(1, "open(%s)", output);
for (cpu = 0; cpu < get_nprocs(); cpu++) { if (cpu != flush_cpu) dirty_on(output_fd, cpu); }
set_affinity(flush_cpu); if (fsync(output_fd)) err(1, "fsync(%s)", output); if (close(output_fd)) err(1, "close(%s)", output); free(buf); }
Make balance_dirty_pages() and wb_over_bg_thresh() work harder to collect exact per memcg counters. This avoids the aforementioned oom kills.
This does not affect the overhead of memory.stat, which still reads the single atomic counter.
Why not use percpu_counter? memcg already handles cpus going offline, so no need for that overhead from percpu_counter. And the percpu_counter spinlocks are more heavyweight than is required.
It probably also makes sense to use exact dirty and writeback counters in memcg oom reports. But that is saved for later.
Cc: stable@vger.kernel.org # v4.16+ Signed-off-by: Greg Thelen gthelen@google.com
Acked-by: Johannes Weiner hannes@cmpxchg.org
Thanks Greg!