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Groups > linux.kernel > #1273315 > unrolled thread
| Started by | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| First post | 2015-11-19 19:00 +0100 |
| Last post | 2015-11-23 09:20 +0100 |
| Articles | 5 on this page of 45 — 7 participants |
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[GIT PULL 00/37] perf/core improvements and fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
[PATCH 31/37] perf callchain: Add count fields to struct callchain_node Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
Re: [PATCH 31/37] perf callchain: Add count fields to struct callchain_node Frederic Weisbecker <fweisbec@gmail.com> - 2015-11-23 15:40 +0100
Re: [PATCH 31/37] perf callchain: Add count fields to struct callchain_node Namhyung Kim <namhyung@kernel.org> - 2015-11-24 06:20 +0100
[PATCH 27/37] perf tools: Fix machine__create_kernel_maps to put kernel dso refcount Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
[PATCH 06/37] perf bpf: Add BPF_PROLOGUE config options for further patches Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
[PATCH 17/37] perf test: Print result for each LLVM subtest Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
[PATCH 30/37] perf callchain: Abstract callchain print function Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
[PATCH 10/37] perf bpf: Allow BPF program config probing options Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
[PATCH 35/37] perf hists browser: Support folded callchains Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
[PATCH 37/37] perf ui/gtk: Support folded callchains Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
[PATCH 36/37] perf ui/gtk: Support flat callchains Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
[PATCH 34/37] perf hists browser: Support flat callchains Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
Re: [PATCH 34/37] perf hists browser: Support flat callchains Frederic Weisbecker <fweisbec@gmail.com> - 2015-11-23 16:20 +0100
Re: [PATCH 34/37] perf hists browser: Support flat callchains Namhyung Kim <namhyung@kernel.org> - 2015-11-24 06:30 +0100
Re: [PATCH 34/37] perf hists browser: Support flat callchains Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com> - 2015-11-24 15:50 +0100
Re: [PATCH 34/37] perf hists browser: Support flat callchains Namhyung Kim <namhyung@kernel.org> - 2015-11-25 02:30 +0100
Re: [PATCH 34/37] perf hists browser: Support flat callchains Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com> - 2015-11-25 02:40 +0100
Re: [PATCH 34/37] perf hists browser: Support flat callchains Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com> - 2015-11-25 03:20 +0100
Re: [PATCH 34/37] perf hists browser: Support flat callchains Namhyung Kim <namhyung@kernel.org> - 2015-11-25 22:10 +0100
[PATCH 03/37] tools: Adopt memdup() from tools/perf, moving it to tools/lib/string.c Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
[PATCH 02/37] tools: Fix selftests_install Makefile rule Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
[PATCH 33/37] perf hists browser: Factor out hist_browser__show_callchain_list() Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
[PATCH 32/37] perf report: Add callchain value option Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:00 +0100
[PATCH 08/37] perf bpf: Allow BPF program attach to uprobe events Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 21/37] perf machine: Fix machine__findnew_module_map to put registered map Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 14/37] perf test: Fix 'perf test BPF' when it fails to find a suitable vmlinux Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 13/37] perf test: Test the BPF prologue adding infrastructure Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 16/37] perf tests: Pass the subtest index to each test routine Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 18/37] perf test: Print result for each BPF subtest Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 11/37] perf bpf: Add prologue for BPF programs for fetching arguments Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 19/37] perf test: Mute test cases error messages if verbose == 0 Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 22/37] perf machine: Fix machine__destroy_kernel_maps to drop vmlinux_maps references Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 12/37] perf bpf: Generate prologue for BPF programs Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 20/37] perf probe: Fix to free temporal Dwarf_Frame Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 25/37] perf tools: Fix to put new map after inserting to map_groups in dso__load_sym Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 28/37] perf machine: Fix machine__findnew_module_map to put dso Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 26/37] perf tools: Fix __dsos__addnew to put dso after adding it to the list Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 04/37] tools: Clone the kernel's strtobool function Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 23/37] perf machine: Fix to destroy kernel maps when machine exits Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
[PATCH 05/37] bpf tools: Load a program with different instances using preprocessor Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-19 19:10 +0100
RE: [GIT PULL 00/37] perf/core improvements and fixes 平松雅巳 / HIRAMATU，MASAMI <masami.hiramatsu.pt@hitachi.com> - 2015-11-20 11:10 +0100
Re: [GIT PULL 00/37] perf/core improvements and fixes 'Arnaldo Carvalho de Melo' <acme@kernel.org> - 2015-11-20 13:10 +0100
RE: [GIT PULL 00/37] perf/core improvements and fixes 平松雅巳 / HIRAMATU，MASAMI <masami.hiramatsu.pt@hitachi.com> - 2015-11-20 18:00 +0100
Re: [GIT PULL 00/37] perf/core improvements and fixes Ingo Molnar <mingo@kernel.org> - 2015-11-23 09:20 +0100
Page 3 of 3 — ← Prev page 1 2 [3]
| From | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| Date | 2015-11-19 19:10 +0100 |
| Subject | [PATCH 05/37] bpf tools: Load a program with different instances using preprocessor |
| Message-ID | <qwBOH-4of-45@gated-at.bofh.it> |
| In reply to | #1273315 |
From: Wang Nan <wangnan0@huawei.com>
This patch is a preparation for BPF prologue support which allows
generating a series of BPF bytecode for fetching kernel data before
calling program code. With the newly introduced multiple instances
support, perf is able to create different prologues for different kprobe
points.
Before this patch, a bpf_program can be loaded into kernel only once,
and get the only resulting fd. What this patch does is to allow creating
and loading different variants of one bpf_program, then fetching their
fds.
Here we describe the basic idea in this patch. The detailed description
of the newly introduced APIs can be found in comments in the patch body.
The key of this patch is the new mechanism in bpf_program__load().
Instead of loading BPF program into kernel directly, it calls a
'pre-processor' to generate program instances which would be finally
loaded into the kernel based on the original code. To enable the
generation of multiple instances, libbpf passes an index to the
pre-processor so it know which instance is being loaded.
Pre-processor should be called from libbpf's user (perf) using
bpf_program__set_prep(). The number of instances and the relationship
between indices and the target instance should be clear when calling
bpf_program__set_prep().
To retrieve a fd for a specific instance of a program,
bpf_program__nth_fd() is introduced. It returns the resulting fd
according to index.
Signed-off-by: He Kuang <hekuang@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: He Kuang <hekuang@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1447675815-166222-8-git-send-email-wangnan0@huawei.com
Signed-off-by: Wang Nan <wangnan0@huawei.com>
[ Enclosed multi-line if/else blocks with {}, (*func_ptr)() -> func_ptr() ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/lib/bpf/libbpf.c | 146 ++++++++++++++++++++++++++++++++++++++++++++++---
tools/lib/bpf/libbpf.h | 64 ++++++++++++++++++++++
2 files changed, 201 insertions(+), 9 deletions(-)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index e176bad19bcb..e3f4c3379f14 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -152,7 +152,11 @@ struct bpf_program {
} *reloc_desc;
int nr_reloc;
- int fd;
+ struct {
+ int nr;
+ int *fds;
+ } instances;
+ bpf_program_prep_t preprocessor;
struct bpf_object *obj;
void *priv;
@@ -206,10 +210,25 @@ struct bpf_object {
static void bpf_program__unload(struct bpf_program *prog)
{
+ int i;
+
if (!prog)
return;
- zclose(prog->fd);
+ /*
+ * If the object is opened but the program was never loaded,
+ * it is possible that prog->instances.nr == -1.
+ */
+ if (prog->instances.nr > 0) {
+ for (i = 0; i < prog->instances.nr; i++)
+ zclose(prog->instances.fds[i]);
+ } else if (prog->instances.nr != -1) {
+ pr_warning("Internal error: instances.nr is %d\n",
+ prog->instances.nr);
+ }
+
+ prog->instances.nr = -1;
+ zfree(&prog->instances.fds);
}
static void bpf_program__exit(struct bpf_program *prog)
@@ -260,7 +279,8 @@ bpf_program__init(void *data, size_t size, char *name, int idx,
memcpy(prog->insns, data,
prog->insns_cnt * sizeof(struct bpf_insn));
prog->idx = idx;
- prog->fd = -1;
+ prog->instances.fds = NULL;
+ prog->instances.nr = -1;
return 0;
errout:
@@ -860,13 +880,73 @@ static int
bpf_program__load(struct bpf_program *prog,
char *license, u32 kern_version)
{
- int err, fd;
+ int err = 0, fd, i;
- err = load_program(prog->insns, prog->insns_cnt,
- license, kern_version, &fd);
- if (!err)
- prog->fd = fd;
+ if (prog->instances.nr < 0 || !prog->instances.fds) {
+ if (prog->preprocessor) {
+ pr_warning("Internal error: can't load program '%s'\n",
+ prog->section_name);
+ return -LIBBPF_ERRNO__INTERNAL;
+ }
+ prog->instances.fds = malloc(sizeof(int));
+ if (!prog->instances.fds) {
+ pr_warning("Not enough memory for BPF fds\n");
+ return -ENOMEM;
+ }
+ prog->instances.nr = 1;
+ prog->instances.fds[0] = -1;
+ }
+
+ if (!prog->preprocessor) {
+ if (prog->instances.nr != 1) {
+ pr_warning("Program '%s' is inconsistent: nr(%d) != 1\n",
+ prog->section_name, prog->instances.nr);
+ }
+ err = load_program(prog->insns, prog->insns_cnt,
+ license, kern_version, &fd);
+ if (!err)
+ prog->instances.fds[0] = fd;
+ goto out;
+ }
+
+ for (i = 0; i < prog->instances.nr; i++) {
+ struct bpf_prog_prep_result result;
+ bpf_program_prep_t preprocessor = prog->preprocessor;
+
+ bzero(&result, sizeof(result));
+ err = preprocessor(prog, i, prog->insns,
+ prog->insns_cnt, &result);
+ if (err) {
+ pr_warning("Preprocessing the %dth instance of program '%s' failed\n",
+ i, prog->section_name);
+ goto out;
+ }
+
+ if (!result.new_insn_ptr || !result.new_insn_cnt) {
+ pr_debug("Skip loading the %dth instance of program '%s'\n",
+ i, prog->section_name);
+ prog->instances.fds[i] = -1;
+ if (result.pfd)
+ *result.pfd = -1;
+ continue;
+ }
+
+ err = load_program(result.new_insn_ptr,
+ result.new_insn_cnt,
+ license, kern_version, &fd);
+
+ if (err) {
+ pr_warning("Loading the %dth instance of program '%s' failed\n",
+ i, prog->section_name);
+ goto out;
+ }
+
+ if (result.pfd)
+ *result.pfd = fd;
+ prog->instances.fds[i] = fd;
+ }
+out:
if (err)
pr_warning("failed to load program '%s'\n",
prog->section_name);
@@ -1121,5 +1201,53 @@ const char *bpf_program__title(struct bpf_program *prog, bool needs_copy)
int bpf_program__fd(struct bpf_program *prog)
{
- return prog->fd;
+ return bpf_program__nth_fd(prog, 0);
+}
+
+int bpf_program__set_prep(struct bpf_program *prog, int nr_instances,
+ bpf_program_prep_t prep)
+{
+ int *instances_fds;
+
+ if (nr_instances <= 0 || !prep)
+ return -EINVAL;
+
+ if (prog->instances.nr > 0 || prog->instances.fds) {
+ pr_warning("Can't set pre-processor after loading\n");
+ return -EINVAL;
+ }
+
+ instances_fds = malloc(sizeof(int) * nr_instances);
+ if (!instances_fds) {
+ pr_warning("alloc memory failed for fds\n");
+ return -ENOMEM;
+ }
+
+ /* fill all fd with -1 */
+ memset(instances_fds, -1, sizeof(int) * nr_instances);
+
+ prog->instances.nr = nr_instances;
+ prog->instances.fds = instances_fds;
+ prog->preprocessor = prep;
+ return 0;
+}
+
+int bpf_program__nth_fd(struct bpf_program *prog, int n)
+{
+ int fd;
+
+ if (n >= prog->instances.nr || n < 0) {
+ pr_warning("Can't get the %dth fd from program %s: only %d instances\n",
+ n, prog->section_name, prog->instances.nr);
+ return -EINVAL;
+ }
+
+ fd = prog->instances.fds[n];
+ if (fd < 0) {
+ pr_warning("%dth instance of program '%s' is invalid\n",
+ n, prog->section_name);
+ return -ENOENT;
+ }
+
+ return fd;
}
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index c9a9aef2806c..949df4b346cf 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -88,6 +88,70 @@ const char *bpf_program__title(struct bpf_program *prog, bool needs_copy);
int bpf_program__fd(struct bpf_program *prog);
+struct bpf_insn;
+
+/*
+ * Libbpf allows callers to adjust BPF programs before being loaded
+ * into kernel. One program in an object file can be transform into
+ * multiple variants to be attached to different code.
+ *
+ * bpf_program_prep_t, bpf_program__set_prep and bpf_program__nth_fd
+ * are APIs for this propose.
+ *
+ * - bpf_program_prep_t:
+ * It defines 'preprocessor', which is a caller defined function
+ * passed to libbpf through bpf_program__set_prep(), and will be
+ * called before program is loaded. The processor should adjust
+ * the program one time for each instances according to the number
+ * passed to it.
+ *
+ * - bpf_program__set_prep:
+ * Attachs a preprocessor to a BPF program. The number of instances
+ * whould be created is also passed through this function.
+ *
+ * - bpf_program__nth_fd:
+ * After the program is loaded, get resuling fds from bpf program for
+ * each instances.
+ *
+ * If bpf_program__set_prep() is not used, the program whould be loaded
+ * without adjustment during bpf_object__load(). The program has only
+ * one instance. In this case bpf_program__fd(prog) is equal to
+ * bpf_program__nth_fd(prog, 0).
+ */
+
+struct bpf_prog_prep_result {
+ /*
+ * If not NULL, load new instruction array.
+ * If set to NULL, don't load this instance.
+ */
+ struct bpf_insn *new_insn_ptr;
+ int new_insn_cnt;
+
+ /* If not NULL, result fd is set to it */
+ int *pfd;
+};
+
+/*
+ * Parameters of bpf_program_prep_t:
+ * - prog: The bpf_program being loaded.
+ * - n: Index of instance being generated.
+ * - insns: BPF instructions array.
+ * - insns_cnt:Number of instructions in insns.
+ * - res: Output parameter, result of transformation.
+ *
+ * Return value:
+ * - Zero: pre-processing success.
+ * - Non-zero: pre-processing, stop loading.
+ */
+typedef int (*bpf_program_prep_t)(struct bpf_program *prog, int n,
+ struct bpf_insn *insns, int insns_cnt,
+ struct bpf_prog_prep_result *res);
+
+int bpf_program__set_prep(struct bpf_program *prog, int nr_instance,
+ bpf_program_prep_t prep);
+
+int bpf_program__nth_fd(struct bpf_program *prog, int n);
+
/*
* We don't need __attribute__((packed)) now since it is
* unnecessary for 'bpf_map_def' because they are all aligned.
--
2.1.0
--
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| From | 平松雅巳 / HIRAMATU，MASAMI <masami.hiramatsu.pt@hitachi.com> |
|---|---|
| Date | 2015-11-20 11:10 +0100 |
| Message-ID | <qwQNI-5O7-9@gated-at.bofh.it> |
| In reply to | #1273315 |
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| From | 'Arnaldo Carvalho de Melo' <acme@kernel.org> |
|---|---|
| Date | 2015-11-20 13:10 +0100 |
| Message-ID | <qwSFR-71A-33@gated-at.bofh.it> |
| In reply to | #1273922 |
Em Fri, Nov 20, 2015 at 10:01:30AM +0000, 平松雅巳 / HIRAMATU，MASAMI escreveu: > Hi Arnaldo, > > I just have a question about the refcnt debugger patch. It seems > that the debugger itself is dropped from this series, would you > have a plan to merge it afterwards? I concentrated on the fixes, leaving the debugger itself to be reviewed later. > Since I'd like to change other refcnts with my refcnt API, and > also to add some features, I'd like to decide I'd better update > my local patches or wait for your work :) You can continue using it as you did, and the fixes can continue to be applied before the debugger itself gets reviewed. - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | 平松雅巳 / HIRAMATU，MASAMI <masami.hiramatsu.pt@hitachi.com> |
|---|---|
| Date | 2015-11-20 18:00 +0100 |
| Message-ID | <qwXcu-1li-7@gated-at.bofh.it> |
| In reply to | #1274016 |
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| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2015-11-23 09:20 +0100 |
| Message-ID | <qxUvV-7DO-11@gated-at.bofh.it> |
| In reply to | #1273315 |
* Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
> Hi Ingo,
>
> Please consider pulling, this was based on tip/perf/urgent and I did a
> test merge of tip/perf/core with tip/perf/urgent and then with this branch,
> haven't noticed problems,
>
> Best regards,
>
> - Arnaldo
>
> The following changes since commit e15bf88a44d1fcb685754b2868b1cd28927af3aa:
>
> Merge tag 'perf-urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent (2015-11-18 06:56:48 +0100)
>
> are available in the git repository at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tags/perf-core-for-mingo
>
> for you to fetch changes up to 2c6caff2b26fde8f3f87183f8c97f2cebfdbcb98:
>
> perf ui/gtk: Support folded callchains (2015-11-19 13:19:26 -0300)
>
> ----------------------------------------------------------------
> perf/core improvements and fixes:
>
> User visible:
>
> - Allows BPF scriptlets specify arguments to be fetched using
> DWARF info, using a prologue generated at compile/build time (He Kuang, Wang Nan)
>
> - Allow attaching BPF scriptlets to module symbols (Wang Nan)
>
> - Allow attaching BPF scriptlets to userspace code using uprobe (Wang Nan)
>
> - BPF programs now can specify 'perf probe' tunables via its section name,
> separating key=val values using semicolons (Wang Nan)
>
> Testing some of these new BPF features:
>
> Use case: get callchains when receiving SSL packets, filter then in the
> kernel, at arbitrary place.
>
> # cat ssl.bpf.c
> #define SEC(NAME) __attribute__((section(NAME), used))
>
> struct pt_regs;
>
> SEC("func=__inet_lookup_established hnum")
> int func(struct pt_regs *ctx, int err, unsigned short port)
> {
> return err == 0 && port == 443;
> }
>
> char _license[] SEC("license") = "GPL";
> int _version SEC("version") = LINUX_VERSION_CODE;
> #
> # perf record -a -g -e ssl.bpf.c
> ^C[ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.787 MB perf.data (3 samples) ]
> # perf script | head -30
> swapper 0 [000] 58783.268118: perf_bpf_probe:func: (ffffffff816a0f60) hnum=0x1bb
> 8a0f61 __inet_lookup_established (/lib/modules/4.3.0+/build/vmlinux)
> 896def ip_rcv_finish (/lib/modules/4.3.0+/build/vmlinux)
> 8976c2 ip_rcv (/lib/modules/4.3.0+/build/vmlinux)
> 855eba __netif_receive_skb_core (/lib/modules/4.3.0+/build/vmlinux)
> 8565d8 __netif_receive_skb (/lib/modules/4.3.0+/build/vmlinux)
> 8572a8 process_backlog (/lib/modules/4.3.0+/build/vmlinux)
> 856b11 net_rx_action (/lib/modules/4.3.0+/build/vmlinux)
> 2a284b __do_softirq (/lib/modules/4.3.0+/build/vmlinux)
> 2a2ba3 irq_exit (/lib/modules/4.3.0+/build/vmlinux)
> 96b7a4 do_IRQ (/lib/modules/4.3.0+/build/vmlinux)
> 969807 ret_from_intr (/lib/modules/4.3.0+/build/vmlinux)
> 2dede5 cpu_startup_entry (/lib/modules/4.3.0+/build/vmlinux)
> 95d5bc rest_init (/lib/modules/4.3.0+/build/vmlinux)
> 1163ffa start_kernel ([kernel.vmlinux].init.text)
> 11634d7 x86_64_start_reservations ([kernel.vmlinux].init.text)
> 1163623 x86_64_start_kernel ([kernel.vmlinux].init.text)
>
> qemu-system-x86 9178 [003] 58785.792417: perf_bpf_probe:func: (ffffffff816a0f60) hnum=0x1bb
> 8a0f61 __inet_lookup_established (/lib/modules/4.3.0+/build/vmlinux)
> 896def ip_rcv_finish (/lib/modules/4.3.0+/build/vmlinux)
> 8976c2 ip_rcv (/lib/modules/4.3.0+/build/vmlinux)
> 855eba __netif_receive_skb_core (/lib/modules/4.3.0+/build/vmlinux)
> 8565d8 __netif_receive_skb (/lib/modules/4.3.0+/build/vmlinux)
> 856660 netif_receive_skb_internal (/lib/modules/4.3.0+/build/vmlinux)
> 8566ec netif_receive_skb_sk (/lib/modules/4.3.0+/build/vmlinux)
> 430a br_handle_frame_finish ([bridge])
> 48bc br_handle_frame ([bridge])
> 855f44 __netif_receive_skb_core (/lib/modules/4.3.0+/build/vmlinux)
> 8565d8 __netif_receive_skb (/lib/modules/4.3.0+/build/vmlinux)
> #
>
> Use 'perf probe' various options to list functions, see what variables can
> be collected at any given point, experiment first collecting without a filter,
> then filter, use it together with 'perf trace', 'perf top', with or without
> callchains, if it explodes, please tell us!
>
> - Introduce a new callchain mode: "folded", that will list per line
> representations of all callchains for a give histogram entry, facilitating
> 'perf report' output processing by other tools, such as Brendan Gregg's
> flamegraph tools (Namhyung Kim)
>
> E.g:
>
> # perf report | grep -v ^# | head
> 18.37% 0.00% swapper [kernel.kallsyms] [k] cpu_startup_entry
> |
> ---cpu_startup_entry
> |
> |--12.07%--start_secondary
> |
> --6.30%--rest_init
> start_kernel
> x86_64_start_reservations
> x86_64_start_kernel
> #
>
> Becomes, in "folded" mode:
>
> # perf report -g folded | grep -v ^# | head -5
> 18.37% 0.00% swapper [kernel.kallsyms] [k] cpu_startup_entry
> 12.07% cpu_startup_entry;start_secondary
> 6.30% cpu_startup_entry;rest_init;start_kernel;x86_64_start_reservations;x86_64_start_kernel
> 16.90% 0.00% swapper [kernel.kallsyms] [k] call_cpuidle
> 11.23% call_cpuidle;cpu_startup_entry;start_secondary
> 5.67% call_cpuidle;cpu_startup_entry;rest_init;start_kernel;x86_64_start_reservations;x86_64_start_kernel
> 16.90% 0.00% swapper [kernel.kallsyms] [k] cpuidle_enter
> 11.23% cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary
> 5.67% cpuidle_enter;call_cpuidle;cpu_startup_entry;rest_init;start_kernel;x86_64_start_reservations;x86_64_start_kernel
> 15.12% 0.00% swapper [kernel.kallsyms] [k] cpuidle_enter_state
> #
>
> The user can also select one of "count", "period" or "percent" as the first column.
>
> Infrastructure:
>
> - Fix multiple leaks found with valgrind and a refcount
> debugger (Masami Hiramatsu)
>
> - Add further 'perf test' entries for BPF and LLVM (Wang Nan)
>
> - Improve 'perf test' to suport subtests, so that the series of tests
> performed in the LLVM and BPF main tests appear in the default 'perf test'
> output (Wang Nan)
>
> - Move memdup() from tools/perf to tools/lib/string.c (Arnaldo Carvalho de Melo)
>
> - Adopt strtobool() from the kernel into tools/lib/ (Wang Nan)
>
> - Fix selftests_install tools/ Makefile rule (Kevin Hilman)
>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
>
> ----------------------------------------------------------------
> Arnaldo Carvalho de Melo (3):
> perf test: Fix build of BPF and LLVM on older glibc libraries
> tools: Adopt memdup() from tools/perf, moving it to tools/lib/string.c
> perf tests: Pass the subtest index to each test routine
>
> He Kuang (1):
> perf bpf: Add prologue for BPF programs for fetching arguments
>
> Kevin Hilman (1):
> tools: Fix selftests_install Makefile rule
>
> Masami Hiramatsu (9):
> perf probe: Fix to free temporal Dwarf_Frame
> perf machine: Fix machine__findnew_module_map to put registered map
> perf machine: Fix machine__destroy_kernel_maps to drop vmlinux_maps references
> perf machine: Fix to destroy kernel maps when machine exits
> perf tools: Make perf_exec_path() always return malloc'd string
> perf tools: Fix to put new map after inserting to map_groups in dso__load_sym
> perf tools: Fix __dsos__addnew to put dso after adding it to the list
> perf tools: Fix machine__create_kernel_maps to put kernel dso refcount
> perf machine: Fix machine__findnew_module_map to put dso
>
> Namhyung Kim (9):
> perf report: Support folded callchain mode on --stdio
> perf callchain: Abstract callchain print function
> perf callchain: Add count fields to struct callchain_node
> perf report: Add callchain value option
> perf hists browser: Factor out hist_browser__show_callchain_list()
> perf hists browser: Support flat callchains
> perf hists browser: Support folded callchains
> perf ui/gtk: Support flat callchains
> perf ui/gtk: Support folded callchains
>
> Wang Nan (14):
> tools: Clone the kernel's strtobool function
> bpf tools: Load a program with different instances using preprocessor
> perf bpf: Add BPF_PROLOGUE config options for further patches
> perf bpf: Compile dwarf-regs.c if CONFIG_BPF_PROLOGUE is on
> perf bpf: Allow BPF program attach to uprobe events
> perf bpf: Allow attaching BPF programs to modules symbols
> perf bpf: Allow BPF program config probing options
> perf bpf: Generate prologue for BPF programs
> perf test: Test the BPF prologue adding infrastructure
> perf test: Fix 'perf test BPF' when it fails to find a suitable vmlinux
> perf bpf: Use same BPF program if arguments are identical
> perf test: Print result for each LLVM subtest
> perf test: Print result for each BPF subtest
> perf test: Mute test cases error messages if verbose == 0
>
> tools/Makefile | 2 +-
> tools/include/linux/string.h | 11 +
> tools/lib/bpf/libbpf.c | 146 ++++++++-
> tools/lib/bpf/libbpf.h | 64 ++++
> tools/lib/string.c | 62 ++++
> tools/perf/Documentation/perf-report.txt | 14 +-
> tools/perf/MANIFEST | 2 +
> tools/perf/arch/x86/include/arch-tests.h | 8 +-
> tools/perf/arch/x86/tests/insn-x86.c | 2 +-
> tools/perf/arch/x86/tests/intel-cqm.c | 2 +-
> tools/perf/arch/x86/tests/perf-time-to-tsc.c | 2 +-
> tools/perf/arch/x86/tests/rdpmc.c | 2 +-
> tools/perf/arch/x86/util/Build | 1 +
> tools/perf/builtin-report.c | 4 +-
> tools/perf/config/Makefile | 12 +
> tools/perf/tests/.gitignore | 1 +
> tools/perf/tests/Build | 9 +-
> tools/perf/tests/attr.c | 2 +-
> tools/perf/tests/bp_signal.c | 2 +-
> tools/perf/tests/bp_signal_overflow.c | 2 +-
> tools/perf/tests/bpf-script-test-prologue.c | 35 +++
> tools/perf/tests/bpf.c | 93 ++++--
> tools/perf/tests/builtin-test.c | 112 ++++++-
> tools/perf/tests/code-reading.c | 2 +-
> tools/perf/tests/dso-data.c | 6 +-
> tools/perf/tests/dwarf-unwind.c | 2 +-
> tools/perf/tests/evsel-roundtrip-name.c | 2 +-
> tools/perf/tests/evsel-tp-sched.c | 2 +-
> tools/perf/tests/fdarray.c | 4 +-
> tools/perf/tests/hists_cumulate.c | 2 +-
> tools/perf/tests/hists_filter.c | 2 +-
> tools/perf/tests/hists_link.c | 2 +-
> tools/perf/tests/hists_output.c | 2 +-
> tools/perf/tests/keep-tracking.c | 2 +-
> tools/perf/tests/kmod-path.c | 2 +-
> tools/perf/tests/llvm.c | 75 +++--
> tools/perf/tests/llvm.h | 2 +
> tools/perf/tests/mmap-basic.c | 2 +-
> tools/perf/tests/mmap-thread-lookup.c | 2 +-
> tools/perf/tests/openat-syscall-all-cpus.c | 2 +-
> tools/perf/tests/openat-syscall-tp-fields.c | 2 +-
> tools/perf/tests/openat-syscall.c | 2 +-
> tools/perf/tests/parse-events.c | 2 +-
> tools/perf/tests/parse-no-sample-id-all.c | 2 +-
> tools/perf/tests/perf-record.c | 2 +-
> tools/perf/tests/pmu.c | 2 +-
> tools/perf/tests/python-use.c | 3 +-
> tools/perf/tests/sample-parsing.c | 2 +-
> tools/perf/tests/sw-clock.c | 2 +-
> tools/perf/tests/switch-tracking.c | 2 +-
> tools/perf/tests/task-exit.c | 2 +-
> tools/perf/tests/tests.h | 89 +++---
> tools/perf/tests/thread-map.c | 2 +-
> tools/perf/tests/thread-mg-share.c | 2 +-
> tools/perf/tests/topology.c | 2 +-
> tools/perf/tests/vmlinux-kallsyms.c | 2 +-
> tools/perf/ui/browsers/hists.c | 315 +++++++++++++++++--
> tools/perf/ui/gtk/hists.c | 148 ++++++++-
> tools/perf/ui/stdio/hist.c | 94 +++++-
> tools/perf/util/Build | 7 +
> tools/perf/util/bpf-loader.c | 434 ++++++++++++++++++++++++-
> tools/perf/util/bpf-loader.h | 4 +
> tools/perf/util/bpf-prologue.c | 455 +++++++++++++++++++++++++++
> tools/perf/util/bpf-prologue.h | 34 ++
> tools/perf/util/callchain.c | 135 +++++++-
> tools/perf/util/callchain.h | 28 +-
> tools/perf/util/dso.c | 2 +
> tools/perf/util/exec_cmd.c | 21 +-
> tools/perf/util/exec_cmd.h | 5 +-
> tools/perf/util/help.c | 6 +-
> tools/perf/util/include/linux/string.h | 3 -
> tools/perf/util/machine.c | 17 +-
> tools/perf/util/probe-event.c | 7 +-
> tools/perf/util/probe-finder.c | 9 +-
> tools/perf/util/string.c | 16 -
> tools/perf/util/symbol-elf.c | 2 +
> tools/perf/util/util.c | 3 +-
> 77 files changed, 2286 insertions(+), 282 deletions(-)
> create mode 100644 tools/include/linux/string.h
> create mode 100644 tools/lib/string.c
> create mode 100644 tools/perf/tests/bpf-script-test-prologue.c
> create mode 100644 tools/perf/util/bpf-prologue.c
> create mode 100644 tools/perf/util/bpf-prologue.h
> delete mode 100644 tools/perf/util/include/linux/string.h
Pulled into tip:perf/core, thanks a lot Arnaldo!
Ingo
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