From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Clark Williams <williams@redhat.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Adrian Hunter <adrian.hunter@intel.com>,
David Ahern <dsahern@gmail.com>, Jiri Olsa <jolsa@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Wang Nan <wangnan0@huawei.com>
Subject: [PATCH 01/44] perf trace: Associate vfs_getname()'ed pathname with fd returned from 'openat'
Date: Thu, 9 Aug 2018 11:57:39 -0300 [thread overview]
Message-ID: <20180809145822.21391-2-acme@kernel.org> (raw)
In-Reply-To: <20180809145822.21391-1-acme@kernel.org>
From: Arnaldo Carvalho de Melo <acme@redhat.com>
When the vfs_getname() wannabe tracepoint is in place:
# perf probe -l
probe:vfs_getname (on getname_flags:73@acme/git/linux/fs/namei.c with pathname)
#
'perf trace' will use it to get the pathname when it is copied from
userspace to the kernel, right after syscalls:sys_enter_open, copied
in the 'probe:vfs_getname', stash it somewhere and then, at
syscalls:sys_exit_open time, if the 'open' return is not -1, i.e. a
successfull open syscall, associate that pathname to this return, i.e.
the fd.
We were not doing this for the 'openat' syscall, which would cause 'perf
trace' to fallback to using /proc to get the fd, change it so that we
use what we got from probe:vfs_getname, reducing the 'openat'
beautification process cost, ditching the syscalls performed to read
procfs state and avoiding some possible races in the process.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-xnp44ao3bkb6ejeczxfnjwsh@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-trace.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 88561eed7950..2a85f5198da0 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -121,7 +121,6 @@ struct trace {
bool force;
bool vfs_getname;
int trace_pgfaults;
- int open_id;
};
struct tp_field {
@@ -805,12 +804,17 @@ static struct syscall_fmt *syscall_fmt__find(const char *name)
return bsearch(name, syscall_fmts, nmemb, sizeof(struct syscall_fmt), syscall_fmt__cmp);
}
+/*
+ * is_exit: is this "exit" or "exit_group"?
+ * is_open: is this "open" or "openat"? To associate the fd returned in sys_exit with the pathname in sys_enter.
+ */
struct syscall {
struct event_format *tp_format;
int nr_args;
+ bool is_exit;
+ bool is_open;
struct format_field *args;
const char *name;
- bool is_exit;
struct syscall_fmt *fmt;
struct syscall_arg_fmt *arg_fmt;
};
@@ -1299,6 +1303,7 @@ static int trace__read_syscall_info(struct trace *trace, int id)
}
sc->is_exit = !strcmp(name, "exit_group") || !strcmp(name, "exit");
+ sc->is_open = !strcmp(name, "open") || !strcmp(name, "openat");
return syscall__set_arg_fmts(sc);
}
@@ -1722,7 +1727,7 @@ static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
ret = perf_evsel__sc_tp_uint(evsel, ret, sample);
- if (id == trace->open_id && ret >= 0 && ttrace->filename.pending_open) {
+ if (sc->is_open && ret >= 0 && ttrace->filename.pending_open) {
trace__set_fd_pathname(thread, ret, ttrace->filename.name);
ttrace->filename.pending_open = false;
++trace->stats.vfs_getname;
@@ -3205,8 +3210,6 @@ int cmd_trace(int argc, const char **argv)
}
}
- trace.open_id = syscalltbl__id(trace.sctbl, "open");
-
err = target__validate(&trace.opts.target);
if (err) {
target__strerror(&trace.opts.target, err, bf, sizeof(bf));
--
2.14.4
next prev parent reply other threads:[~2018-08-09 14:57 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-09 14:57 [GIT PULL 00/44] perf/core improvements and fixes Arnaldo Carvalho de Melo
2018-08-09 14:57 ` Arnaldo Carvalho de Melo [this message]
2018-08-09 14:57 ` [PATCH 02/44] perf trace: Use beautifiers on syscalls:sys_enter_ handlers Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 03/44] perf trace: Rename some syscall_tp methods to raw_syscall Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 04/44] perf trace: Allow setting up a syscall_tp struct without a format_field Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 05/44] perf trace: Setup struct syscall_tp for syscalls:sys_{enter,exit}_NAME events Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 06/44] perf trace: Use perf_evsel__sc_tp_{uint,ptr} for "id"/"args" handling syscalls:* events Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 07/44] perf auxtrace: Support for perf report -D for s390 Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 08/44] perf report: Add raw report support for s390 auxiliary trace Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 09/44] perf report: Add GUI " Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 10/44] perf vendor events arm64: Enable JSON events for eMAG Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 11/44] perf tools: Drop unneeded bitmap_zero() calls Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 12/44] perf bpf: Add 'syscall_enter' probe helper for syscall enter tracepoints Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 13/44] perf annotate: Make symbol__annotate_fprintf2() local Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 14/44] perf annotate: Make annotation_line__max_percent static Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 15/44] perf annotate: Get rid of annotation__scnprintf_samples_period() Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 16/44] perf annotate: Rename struct annotation_line::samples* to data* Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 17/44] perf annotate: Rename local sample variables to data Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 18/44] perf annotate: Rename hist to sym_hist in annotation__calc_percent Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 19/44] perf annotate: Loop group events directly in annotation__calc_percent() Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 20/44] perf annotate: Switch struct annotation_data::percent to array Arnaldo Carvalho de Melo
2018-08-09 14:57 ` [PATCH 21/44] perf annotate: Add PERCENT_HITS_GLOBAL percent value Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 22/44] perf annotate: Add PERCENT_PERIOD_LOCAL " Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 23/44] perf annotate: Add PERCENT_PERIOD_GLOBAL " Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 24/44] perf annotate: Add percent_type to struct annotation_options Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 25/44] perf annotate: Pass struct annotation_options to symbol__calc_lines() Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 26/44] perf annotate: Pass 'struct annotation_options' to map_symbol__annotation_dump() Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 27/44] perf annotate: Pass browser percent_type in annotate_browser__calc_percent() Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 28/44] perf annotate: Add support to toggle percent type Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 29/44] perf annotate: Make local period the default " Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 30/44] perf annotate: Display percent type in stdio output Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 31/44] perf annotate: Add --percent-type option Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 32/44] perf report: " Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 33/44] perf bpf: Add struct bpf_map struct Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 34/44] perf bpf: Add bpf/stdio.h wrapper to bpf_perf_event_output function Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 35/44] perf bpf: Make bpf__for_each_stdout_map() generic Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 36/44] perf bpf: Generalize bpf__setup_stdout() Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 37/44] perf bpf: Add bpf__setup_output_event() strerror() counterpart Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 38/44] perf bpf: Add wrappers to BPF_FUNC_probe_read(_str) functions Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 39/44] perf trace: Handle "bpf-output" events associated with "__augmented_syscalls__" BPF map Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 40/44] perf bpf: Make bpf__setup_output_event() return the bpf-output event Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 41/44] perf trace: Setup the augmented syscalls bpf-output event fields Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 42/44] perf trace: Wire up the augmented syscalls with the syscalls:sys_enter_FOO beautifier Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 43/44] perf map: Synthesize maps only for thread group leader Arnaldo Carvalho de Melo
2018-08-09 14:58 ` [PATCH 44/44] perf map: Optimize maps__fixup_overlappings() Arnaldo Carvalho de Melo
2018-08-09 15:27 ` [GIT PULL 00/44] perf/core improvements and fixes Kim Phillips
2018-08-09 15:35 ` Arnaldo Carvalho de Melo
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