Pass external callchain entry to get_perf_callchain #10263
Conversation
|
Upstream branch: 026bcf9 |
|
Upstream branch: 3249e8a |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/1022592=>bpf-next
branch
from
7e8242e to
9e9f2fa
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
910d3ce to
50dc55d
Compare
|
Upstream branch: f1d8c65 |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/1022592=>bpf-next
branch
from
9e9f2fa to
2daf675
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
50dc55d to
f882b4c
Compare
|
Upstream branch: 93ce3be |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/1022592=>bpf-next
branch
from
2daf675 to
fbe4343
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
f882b4c to
4752827
Compare
|
Upstream branch: 93ce3be |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/1022592=>bpf-next
branch
from
fbe4343 to
14687dc
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
4752827 to
05f2f03
Compare
|
Upstream branch: c1da3df |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/1022592=>bpf-next
branch
from
14687dc to
6ef22c4
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
05f2f03 to
c343f72
Compare
|
Upstream branch: e5d2e34 |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/1022592=>bpf-next
branch
from
6ef22c4 to
3069d1e
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
c343f72 to
6a32d09
Compare
|
Upstream branch: fea3f5e |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/1022592=>bpf-next
branch
from
3069d1e to
5f1952d
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
6a32d09 to
b967d93
Compare
|
Upstream branch: 63066b7 |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/1022592=>bpf-next
branch
from
5f1952d to
a05c18b
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
b967d93 to
250c35a
Compare
|
Upstream branch: c133390 |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/1022592=>bpf-next
branch
from
a05c18b to
337bc20
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
250c35a to
5630fb8
Compare
|
Upstream branch: ef2c0b2 |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/1022592=>bpf-next
branch
from
337bc20 to
52ab1ad
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
5630fb8 to
f815251
Compare
|
Upstream branch: a4d31f4 |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/1022592=>bpf-next
branch
from
52ab1ad to
24f09ae
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
f815251 to
eb66b0c
Compare
From BPF stack map, we want to ensure that the callchain buffer will not be overwritten by other preemptive tasks. Peter suggested provide more flexible stack-sampling APIs, which can be used in BPF, and we can still use the perf callchain entry with the help of these APIs. The next patch will modify the BPF part. In the future, these APIs will also make it convenient for us to add stack-sampling kfuncs in the eBPF subsystem, just as Andrii and Alexei discussed earlier. Signed-off-by: Peter Zijlstra <[email protected]> Signed-off-by: Tao Chen <[email protected]>
As Alexei noted, get_perf_callchain() return values may be reused if a task is preempted after the BPF program enters migrate disable mode. The perf_callchain_entres has a small stack of entries, and we can reuse it as follows: 1. get the perf callchain entry 2. BPF use... 3. put the perf callchain entry And Peter suggested that get_recursion_context used with preemption disabled, so we should disable preemption at BPF side. Signed-off-by: Tao Chen <[email protected]> Acked-by: Yonghong Song <[email protected]>
|
Upstream branch: 4f7bc83 |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/1022592=>bpf-next
branch
from
24f09ae to
07b7973
Compare
Pull request for series with
subject: Pass external callchain entry to get_perf_callchain
version: 6
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1022592