Skip to content

K
Kernel

openeuler / Kernel
大约 2 年 前同步成功

通知 8
Star 0
Fork 0
K
Kernel
切换分支/标签
  1. 21 9月, 2022 1 次提交
  3. 31 8月, 2022 2 次提交
  5. 24 8月, 2022 22 次提交
  7. 22 8月, 2022 9 次提交
  9. 27 7月, 2022 2 次提交
    • R
      bpf: sched: add convenient helpers to identify sched entities · 628738d6
      由 Roman Gushchin 提交于 
      maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5F6X6
CVE: NA

Reference: https://lore.kernel.org/all/20210916162451.709260-1-guro@fb.com/

-------------------

This patch adds 3 helpers useful for dealing with sched entities:
  u64 bpf_sched_entity_to_tgidpid(struct sched_entity *se);
  u64 bpf_sched_entity_to_cgrpid(struct sched_entity *se);
  long bpf_sched_entity_belongs_to_cgrp(struct sched_entity *se,
  	u64 cgrpid);

Sched entity is a basic structure used by the scheduler to represent
schedulable objects: tasks and cgroups (if CONFIG_FAIR_GROUP_SCHED
is enabled). It will be passed as an argument to many bpf hooks, so
scheduler bpf programs need a convenient way to deal with it.

bpf_sched_entity_to_tgidpid() and bpf_sched_entity_to_cgrpid() are
useful to identify a sched entity in userspace terms (pid, tgid and
cgroup id). bpf_sched_entity_belongs_to_cgrp() allows to check whether
a sched entity belongs to sub-tree of a cgroup. It allows to write
cgroup-specific scheduler policies even without enabling the cgroup
cpu controller.
Signed-off-by: NRoman Gushchin <guro@fb.com>
Signed-off-by: NChen Hui <judy.chenhui@huawei.com>
Signed-off-by: NRen Zhijie <renzhijie2@huawei.com>
      628738d6
    • R
      bpf: sched: basic infrastructure for scheduler bpf · d93afd18
      由 Roman Gushchin 提交于 
      maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5F6X6
CVE: NA

Reference: https://lore.kernel.org/all/20210916162451.709260-1-guro@fb.com/

-------------------

This commit introduces basic definitions and infrastructure for
scheduler bpf programs. It defines the BPF_PROG_TYPE_SCHED program
type and the BPF_SCHED attachment type.

The implementation is inspired by lsm bpf programs and is based on
kretprobes. This will allow to add new hooks with a minimal changes to
the kernel code and without any changes to libbpf/bpftool.
It's very convenient as I anticipate a large number of private patches
being used for a long time before (or if at all) reaching upstream.

Sched programs are expected to return an int, which meaning will be
context defined.

This patch doesn't add any real scheduler hooks (only a stub), it will
be done by following patches in the series.

Scheduler bpf programs as now are very restricted in what they can do:
only the bpf_printk() helper is available. The scheduler context can
impose significant restrictions on what's safe and what's not. So
let's extend their abilities on case by case basis when a need arise.
Signed-off-by: NRoman Gushchin <guro@fb.com>
Signed-off-by: NChen Hui <judy.chenhui@huawei.com>
Signed-off-by: NRen Zhijie <renzhijie2@huawei.com>
      d93afd18
  11. 18 7月, 2022 1 次提交
  13. 06 7月, 2022 2 次提交
  15. 10 5月, 2022 1 次提交