[PATCH v1 3/4] perf bpf examples: With no BPF events remove examples
From: Ian Rogers
Date: Thu Aug 10 2023 - 14:49:29 EST
The examples were used to give demonstrations of BPF events but such
functionality is now subsumed by using --filter with perf record or
the direct use of BPF skeletons.
Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
tools/perf/Makefile.perf | 5 --
tools/perf/examples/bpf/5sec.c | 53 ----------------------
tools/perf/examples/bpf/empty.c | 12 -----
tools/perf/examples/bpf/hello.c | 27 -----------
tools/perf/examples/bpf/sys_enter_openat.c | 33 --------------
5 files changed, 130 deletions(-)
delete mode 100644 tools/perf/examples/bpf/5sec.c
delete mode 100644 tools/perf/examples/bpf/empty.c
delete mode 100644 tools/perf/examples/bpf/hello.c
delete mode 100644 tools/perf/examples/bpf/sys_enter_openat.c
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 0e1597712b95..a76a2a8f59b7 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -962,11 +962,6 @@ ifndef NO_JVMTI
endif
$(call QUIET_INSTALL, libexec) \
$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
-ifndef NO_LIBBPF
- $(call QUIET_INSTALL, bpf-examples) \
- $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perf_examples_instdir_SQ)/bpf'; \
- $(INSTALL) examples/bpf/*.c -m 644 -t '$(DESTDIR_SQ)$(perf_examples_instdir_SQ)/bpf'
-endif
$(call QUIET_INSTALL, perf-archive) \
$(INSTALL) $(OUTPUT)perf-archive -t '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
$(call QUIET_INSTALL, perf-iostat) \
diff --git a/tools/perf/examples/bpf/5sec.c b/tools/perf/examples/bpf/5sec.c
deleted file mode 100644
index 3bd7fc17631f..000000000000
--- a/tools/perf/examples/bpf/5sec.c
+++ /dev/null
@@ -1,53 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- Description:
-
- . Disable strace like syscall tracing (--no-syscalls), or try tracing
- just some (-e *sleep).
-
- . Attach a filter function to a kernel function, returning when it should
- be considered, i.e. appear on the output.
-
- . Run it system wide, so that any sleep of >= 5 seconds and < than 6
- seconds gets caught.
-
- . Ask for callgraphs using DWARF info, so that userspace can be unwound
-
- . While this is running, run something like "sleep 5s".
-
- . If we decide to add tv_nsec as well, then it becomes:
-
- int probe(hrtimer_nanosleep, rqtp->tv_sec rqtp->tv_nsec)(void *ctx, int err, long sec, long nsec)
-
- I.e. add where it comes from (rqtp->tv_nsec) and where it will be
- accessible in the function body (nsec)
-
- # perf trace --no-syscalls -e tools/perf/examples/bpf/5sec.c/call-graph=dwarf/
- 0.000 perf_bpf_probe:func:(ffffffff9811b5f0) tv_sec=5
- hrtimer_nanosleep ([kernel.kallsyms])
- __x64_sys_nanosleep ([kernel.kallsyms])
- do_syscall_64 ([kernel.kallsyms])
- entry_SYSCALL_64 ([kernel.kallsyms])
- __GI___nanosleep (/usr/lib64/libc-2.26.so)
- rpl_nanosleep (/usr/bin/sleep)
- xnanosleep (/usr/bin/sleep)
- main (/usr/bin/sleep)
- __libc_start_main (/usr/lib64/libc-2.26.so)
- _start (/usr/bin/sleep)
- ^C#
-
- Copyright (C) 2018 Red Hat, Inc., Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
-*/
-
-#include <linux/bpf.h>
-#include <bpf/bpf_helpers.h>
-
-#define NSEC_PER_SEC 1000000000L
-
-SEC("hrtimer_nanosleep=hrtimer_nanosleep rqtp")
-int hrtimer_nanosleep(void *ctx, int err, long long sec)
-{
- return sec / NSEC_PER_SEC == 5ULL;
-}
-
-char _license[] SEC("license") = "GPL";
diff --git a/tools/perf/examples/bpf/empty.c b/tools/perf/examples/bpf/empty.c
deleted file mode 100644
index 3e296c0c53d7..000000000000
--- a/tools/perf/examples/bpf/empty.c
+++ /dev/null
@@ -1,12 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/bpf.h>
-#include <bpf/bpf_helpers.h>
-
-struct syscall_enter_args;
-
-SEC("raw_syscalls:sys_enter")
-int sys_enter(struct syscall_enter_args *args)
-{
- return 0;
-}
-char _license[] SEC("license") = "GPL";
diff --git a/tools/perf/examples/bpf/hello.c b/tools/perf/examples/bpf/hello.c
deleted file mode 100644
index e9080b0df158..000000000000
--- a/tools/perf/examples/bpf/hello.c
+++ /dev/null
@@ -1,27 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/bpf.h>
-#include <bpf/bpf_helpers.h>
-
-struct __bpf_stdout__ {
- __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
- __type(key, int);
- __type(value, __u32);
- __uint(max_entries, __NR_CPUS__);
-} __bpf_stdout__ SEC(".maps");
-
-#define puts(from) \
- ({ const int __len = sizeof(from); \
- char __from[sizeof(from)] = from; \
- bpf_perf_event_output(args, &__bpf_stdout__, BPF_F_CURRENT_CPU, \
- &__from, __len & (sizeof(from) - 1)); })
-
-struct syscall_enter_args;
-
-SEC("raw_syscalls:sys_enter")
-int sys_enter(struct syscall_enter_args *args)
-{
- puts("Hello, world\n");
- return 0;
-}
-
-char _license[] SEC("license") = "GPL";
diff --git a/tools/perf/examples/bpf/sys_enter_openat.c b/tools/perf/examples/bpf/sys_enter_openat.c
deleted file mode 100644
index c4481c390d23..000000000000
--- a/tools/perf/examples/bpf/sys_enter_openat.c
+++ /dev/null
@@ -1,33 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Hook into 'openat' syscall entry tracepoint
- *
- * Test it with:
- *
- * perf trace -e tools/perf/examples/bpf/sys_enter_openat.c cat /etc/passwd > /dev/null
- *
- * It'll catch some openat syscalls related to the dynamic linked and
- * the last one should be the one for '/etc/passwd'.
- *
- * The syscall_enter_openat_args can be used to get the syscall fields
- * and use them for filtering calls, i.e. use in expressions for
- * the return value.
- */
-
-#include <bpf/bpf.h>
-
-struct syscall_enter_openat_args {
- unsigned long long unused;
- long syscall_nr;
- long dfd;
- char *filename_ptr;
- long flags;
- long mode;
-};
-
-int syscall_enter(openat)(struct syscall_enter_openat_args *args)
-{
- return 1;
-}
-
-license(GPL);
--
2.41.0.640.ga95def55d0-goog