Kan Liang c53e14f1ea perf: Extend per event callchain limit to branch stack ... The commit 97c79a38cd ("perf core: Per event callchain limit") introduced a per-event term to allow finer tuning of the depth of callchains to save space. It should be applied to the branch stack as well. For example, autoFDO collections require maximum LBR entries. In the meantime, other system-wide LBR users may only be interested in the latest a few number of LBRs. A per-event LBR depth would save the perf output buffer. The patch simply drops the uninterested branches, but HW still collects the maximum branches. There may be a model-specific optimization that can reduce the HW depth for some cases to reduce the overhead further. But it isn't included in the patch set. Because it's not useful for all cases. For example, ARCH LBR can utilize the PEBS and XSAVE to collect LBRs. The depth should have less impact on the collecting overhead. The model-specific optimization may be implemented later separately. Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20250310181536.3645382-1-kan.liang@linux.intel.com		2025-03-17 11:23:36 +01:00
..
acpi	LoongArch changes for v6.14	2025-01-28 08:52:01 -08:00
asm-generic	Fix an objtool false positive, and objtool related	2025-02-28 16:45:36 -08:00
clocksource	KVM/arm64 updates for 6.14	2025-01-28 09:01:36 -08:00
crypto
cxl
drm	drm: Fix DSC BPP increment decoding	2025-02-13 10:20:30 +02:00
dt-bindings	dt-bindings: clock: qcom: Add CAMCC clocks for QCS8300	2025-02-02 20:59:04 -06:00
hyperv
keys	keys: drop shadowing dead prototype	2025-01-21 11:25:23 +02:00
kunit	linux_kselftest-kunit-6.14-rc1	2025-01-22 12:32:39 -08:00
kvm
linux	perf: Extend per event callchain limit to branch stack	2025-03-17 11:23:36 +01:00
math-emu
media
memory
misc
net	Including fixes from bluetooth. We didn't get netfilter or wireless PRs	2025-02-27 09:32:42 -08:00
pcmcia
ras
rdma
rv	rv: Reset per-task monitors also for idle tasks	2025-01-23 12:16:04 -05:00
scsi	Driver core and debugfs updates	2025-01-28 12:25:12 -08:00
soc	soc: driver updates for 6.14	2025-01-24 14:56:59 -08:00
sound	ASoC: cs35l56: Prevent races when soft-resetting using SPI control	2025-02-25 15:06:58 +00:00
target
trace	Including fixes from bluetooth. We didn't get netfilter or wireless PRs	2025-02-27 09:32:42 -08:00
uapi	perf: Extend per event callchain limit to branch stack	2025-03-17 11:23:36 +01:00
ufs	scsi: ufs: core: Fix use-after free in init error and remove paths	2025-02-03 17:20:01 -05:00
vdso
video
xen