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Message-Id: <20240524205227.244375-2-irogers@google.com>
Date: Fri, 24 May 2024 13:52:25 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>,
Kan Liang <kan.liang@...ux.intel.com>, Changbin Du <changbin.du@...wei.com>,
Yang Jihong <yangjihong1@...wei.com>, Andrii Nakryiko <andrii@...nel.org>,
John Fastabend <john.fastabend@...il.com>, linux-perf-users@...r.kernel.org,
linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH v3 1/3] perf bpf filter: Give terms their own enum
Give the term types their own enum so that additional terms can be
added that don't correspond to a PERF_SAMPLE_xx flag. The term values
are numerically ascending rather than bit field positions, this means
they need translating to a PERF_SAMPLE_xx bit field in certain places
using a shift.
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
tools/perf/util/bpf-filter.c | 28 ++++----
tools/perf/util/bpf-filter.h | 5 +-
tools/perf/util/bpf-filter.l | 64 +++++++++---------
tools/perf/util/bpf-filter.y | 7 +-
tools/perf/util/bpf_skel/sample-filter.h | 37 ++++++++++-
tools/perf/util/bpf_skel/sample_filter.bpf.c | 69 +++++++++++++++-----
6 files changed, 141 insertions(+), 69 deletions(-)
diff --git a/tools/perf/util/bpf-filter.c b/tools/perf/util/bpf-filter.c
index b51544996046..f10148623a8e 100644
--- a/tools/perf/util/bpf-filter.c
+++ b/tools/perf/util/bpf-filter.c
@@ -17,11 +17,11 @@
#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
-#define __PERF_SAMPLE_TYPE(st, opt) { st, #st, opt }
-#define PERF_SAMPLE_TYPE(_st, opt) __PERF_SAMPLE_TYPE(PERF_SAMPLE_##_st, opt)
+#define __PERF_SAMPLE_TYPE(tt, st, opt) { tt, #st, opt }
+#define PERF_SAMPLE_TYPE(_st, opt) __PERF_SAMPLE_TYPE(PBF_TERM_##_st, PERF_SAMPLE_##_st, opt)
static const struct perf_sample_info {
- u64 type;
+ enum perf_bpf_filter_term type;
const char *name;
const char *option;
} sample_table[] = {
@@ -44,12 +44,12 @@ static const struct perf_sample_info {
PERF_SAMPLE_TYPE(DATA_PAGE_SIZE, "--data-page-size"),
};
-static const struct perf_sample_info *get_sample_info(u64 flags)
+static const struct perf_sample_info *get_sample_info(enum perf_bpf_filter_term type)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(sample_table); i++) {
- if (sample_table[i].type == flags)
+ if (sample_table[i].type == type)
return &sample_table[i];
}
return NULL;
@@ -59,7 +59,8 @@ static int check_sample_flags(struct evsel *evsel, struct perf_bpf_filter_expr *
{
const struct perf_sample_info *info;
- if (evsel->core.attr.sample_type & expr->sample_flags)
+ if (expr->term >= PBF_TERM_SAMPLE_START && expr->term <= PBF_TERM_SAMPLE_END &&
+ (evsel->core.attr.sample_type & (1 << (expr->term - PBF_TERM_SAMPLE_START))))
return 0;
if (expr->op == PBF_OP_GROUP_BEGIN) {
@@ -72,10 +73,10 @@ static int check_sample_flags(struct evsel *evsel, struct perf_bpf_filter_expr *
return 0;
}
- info = get_sample_info(expr->sample_flags);
+ info = get_sample_info(expr->term);
if (info == NULL) {
- pr_err("Error: %s event does not have sample flags %lx\n",
- evsel__name(evsel), expr->sample_flags);
+ pr_err("Error: %s event does not have sample flags %d\n",
+ evsel__name(evsel), expr->term);
return -1;
}
@@ -105,7 +106,7 @@ int perf_bpf_filter__prepare(struct evsel *evsel)
struct perf_bpf_filter_entry entry = {
.op = expr->op,
.part = expr->part,
- .flags = expr->sample_flags,
+ .term = expr->term,
.value = expr->val,
};
@@ -122,7 +123,7 @@ int perf_bpf_filter__prepare(struct evsel *evsel)
struct perf_bpf_filter_entry group_entry = {
.op = group->op,
.part = group->part,
- .flags = group->sample_flags,
+ .term = group->term,
.value = group->val,
};
bpf_map_update_elem(fd, &i, &group_entry, BPF_ANY);
@@ -173,7 +174,8 @@ u64 perf_bpf_filter__lost_count(struct evsel *evsel)
return skel ? skel->bss->dropped : 0;
}
-struct perf_bpf_filter_expr *perf_bpf_filter_expr__new(unsigned long sample_flags, int part,
+struct perf_bpf_filter_expr *perf_bpf_filter_expr__new(enum perf_bpf_filter_term term,
+ int part,
enum perf_bpf_filter_op op,
unsigned long val)
{
@@ -181,7 +183,7 @@ struct perf_bpf_filter_expr *perf_bpf_filter_expr__new(unsigned long sample_flag
expr = malloc(sizeof(*expr));
if (expr != NULL) {
- expr->sample_flags = sample_flags;
+ expr->term = term;
expr->part = part;
expr->op = op;
expr->val = val;
diff --git a/tools/perf/util/bpf-filter.h b/tools/perf/util/bpf-filter.h
index 7afd159411b8..cd6764442c16 100644
--- a/tools/perf/util/bpf-filter.h
+++ b/tools/perf/util/bpf-filter.h
@@ -11,14 +11,15 @@ struct perf_bpf_filter_expr {
struct list_head groups;
enum perf_bpf_filter_op op;
int part;
- unsigned long sample_flags;
+ enum perf_bpf_filter_term term;
unsigned long val;
};
struct evsel;
#ifdef HAVE_BPF_SKEL
-struct perf_bpf_filter_expr *perf_bpf_filter_expr__new(unsigned long sample_flags, int part,
+struct perf_bpf_filter_expr *perf_bpf_filter_expr__new(enum perf_bpf_filter_term term,
+ int part,
enum perf_bpf_filter_op op,
unsigned long val);
int perf_bpf_filter__parse(struct list_head *expr_head, const char *str);
diff --git a/tools/perf/util/bpf-filter.l b/tools/perf/util/bpf-filter.l
index d4ff0f1345cd..62c959813466 100644
--- a/tools/perf/util/bpf-filter.l
+++ b/tools/perf/util/bpf-filter.l
@@ -9,16 +9,16 @@
#include "bpf-filter.h"
#include "bpf-filter-bison.h"
-static int sample(unsigned long sample_flag)
+static int sample(enum perf_bpf_filter_term term)
{
- perf_bpf_filter_lval.sample.type = sample_flag;
+ perf_bpf_filter_lval.sample.term = term;
perf_bpf_filter_lval.sample.part = 0;
return BFT_SAMPLE;
}
-static int sample_part(unsigned long sample_flag, int part)
+static int sample_part(enum perf_bpf_filter_term term, int part)
{
- perf_bpf_filter_lval.sample.type = sample_flag;
+ perf_bpf_filter_lval.sample.term = term;
perf_bpf_filter_lval.sample.part = part;
return BFT_SAMPLE;
}
@@ -67,34 +67,34 @@ ident [_a-zA-Z][_a-zA-Z0-9]+
{num_hex} { return value(16); }
{space} { }
-ip { return sample(PERF_SAMPLE_IP); }
-id { return sample(PERF_SAMPLE_ID); }
-tid { return sample(PERF_SAMPLE_TID); }
-pid { return sample_part(PERF_SAMPLE_TID, 1); }
-cpu { return sample(PERF_SAMPLE_CPU); }
-time { return sample(PERF_SAMPLE_TIME); }
-addr { return sample(PERF_SAMPLE_ADDR); }
-period { return sample(PERF_SAMPLE_PERIOD); }
-txn { return sample(PERF_SAMPLE_TRANSACTION); }
-weight { return sample(PERF_SAMPLE_WEIGHT); }
-weight1 { return sample_part(PERF_SAMPLE_WEIGHT_STRUCT, 1); }
-weight2 { return sample_part(PERF_SAMPLE_WEIGHT_STRUCT, 2); }
-weight3 { return sample_part(PERF_SAMPLE_WEIGHT_STRUCT, 3); }
-ins_lat { return sample_part(PERF_SAMPLE_WEIGHT_STRUCT, 2); } /* alias for weight2 */
-p_stage_cyc { return sample_part(PERF_SAMPLE_WEIGHT_STRUCT, 3); } /* alias for weight3 */
-retire_lat { return sample_part(PERF_SAMPLE_WEIGHT_STRUCT, 3); } /* alias for weight3 */
-phys_addr { return sample(PERF_SAMPLE_PHYS_ADDR); }
-code_pgsz { return sample(PERF_SAMPLE_CODE_PAGE_SIZE); }
-data_pgsz { return sample(PERF_SAMPLE_DATA_PAGE_SIZE); }
-mem_op { return sample_part(PERF_SAMPLE_DATA_SRC, 1); }
-mem_lvlnum { return sample_part(PERF_SAMPLE_DATA_SRC, 2); }
-mem_lvl { return sample_part(PERF_SAMPLE_DATA_SRC, 2); } /* alias for mem_lvlnum */
-mem_snoop { return sample_part(PERF_SAMPLE_DATA_SRC, 3); } /* include snoopx */
-mem_remote { return sample_part(PERF_SAMPLE_DATA_SRC, 4); }
-mem_lock { return sample_part(PERF_SAMPLE_DATA_SRC, 5); }
-mem_dtlb { return sample_part(PERF_SAMPLE_DATA_SRC, 6); }
-mem_blk { return sample_part(PERF_SAMPLE_DATA_SRC, 7); }
-mem_hops { return sample_part(PERF_SAMPLE_DATA_SRC, 8); }
+ip { return sample(PBF_TERM_IP); }
+id { return sample(PBF_TERM_ID); }
+tid { return sample(PBF_TERM_TID); }
+pid { return sample_part(PBF_TERM_TID, 1); }
+cpu { return sample(PBF_TERM_CPU); }
+time { return sample(PBF_TERM_TIME); }
+addr { return sample(PBF_TERM_ADDR); }
+period { return sample(PBF_TERM_PERIOD); }
+txn { return sample(PBF_TERM_TRANSACTION); }
+weight { return sample(PBF_TERM_WEIGHT); }
+weight1 { return sample_part(PBF_TERM_WEIGHT_STRUCT, 1); }
+weight2 { return sample_part(PBF_TERM_WEIGHT_STRUCT, 2); }
+weight3 { return sample_part(PBF_TERM_WEIGHT_STRUCT, 3); }
+ins_lat { return sample_part(PBF_TERM_WEIGHT_STRUCT, 2); } /* alias for weight2 */
+p_stage_cyc { return sample_part(PBF_TERM_WEIGHT_STRUCT, 3); } /* alias for weight3 */
+retire_lat { return sample_part(PBF_TERM_WEIGHT_STRUCT, 3); } /* alias for weight3 */
+phys_addr { return sample(PBF_TERM_PHYS_ADDR); }
+code_pgsz { return sample(PBF_TERM_CODE_PAGE_SIZE); }
+data_pgsz { return sample(PBF_TERM_DATA_PAGE_SIZE); }
+mem_op { return sample_part(PBF_TERM_DATA_SRC, 1); }
+mem_lvlnum { return sample_part(PBF_TERM_DATA_SRC, 2); }
+mem_lvl { return sample_part(PBF_TERM_DATA_SRC, 2); } /* alias for mem_lvlnum */
+mem_snoop { return sample_part(PBF_TERM_DATA_SRC, 3); } /* include snoopx */
+mem_remote { return sample_part(PBF_TERM_DATA_SRC, 4); }
+mem_lock { return sample_part(PBF_TERM_DATA_SRC, 5); }
+mem_dtlb { return sample_part(PBF_TERM_DATA_SRC, 6); }
+mem_blk { return sample_part(PBF_TERM_DATA_SRC, 7); }
+mem_hops { return sample_part(PBF_TERM_DATA_SRC, 8); }
"==" { return operator(PBF_OP_EQ); }
"!=" { return operator(PBF_OP_NEQ); }
diff --git a/tools/perf/util/bpf-filter.y b/tools/perf/util/bpf-filter.y
index 0e4d6de3c2ad..0c56fccb8874 100644
--- a/tools/perf/util/bpf-filter.y
+++ b/tools/perf/util/bpf-filter.y
@@ -27,7 +27,7 @@ static void perf_bpf_filter_error(struct list_head *expr __maybe_unused,
{
unsigned long num;
struct {
- unsigned long type;
+ enum perf_bpf_filter_term term;
int part;
} sample;
enum perf_bpf_filter_op op;
@@ -62,7 +62,8 @@ filter_term BFT_LOGICAL_OR filter_expr
if ($1->op == PBF_OP_GROUP_BEGIN) {
expr = $1;
} else {
- expr = perf_bpf_filter_expr__new(0, 0, PBF_OP_GROUP_BEGIN, 1);
+ expr = perf_bpf_filter_expr__new(PBF_TERM_NONE, /*part=*/0,
+ PBF_OP_GROUP_BEGIN, /*val=*/1);
list_add_tail(&$1->list, &expr->groups);
}
expr->val++;
@@ -78,7 +79,7 @@ filter_expr
filter_expr:
BFT_SAMPLE BFT_OP BFT_NUM
{
- $$ = perf_bpf_filter_expr__new($1.type, $1.part, $2, $3);
+ $$ = perf_bpf_filter_expr__new($1.term, $1.part, $2, $3);
}
%%
diff --git a/tools/perf/util/bpf_skel/sample-filter.h b/tools/perf/util/bpf_skel/sample-filter.h
index 2e96e1ab084a..25f780022951 100644
--- a/tools/perf/util/bpf_skel/sample-filter.h
+++ b/tools/perf/util/bpf_skel/sample-filter.h
@@ -16,12 +16,45 @@ enum perf_bpf_filter_op {
PBF_OP_GROUP_END,
};
+enum perf_bpf_filter_term {
+ /* No term is in use. */
+ PBF_TERM_NONE = 0,
+ /* Terms that correspond to PERF_SAMPLE_xx values. */
+ PBF_TERM_SAMPLE_START = PBF_TERM_NONE + 1,
+ PBF_TERM_IP = PBF_TERM_SAMPLE_START + 0, /* SAMPLE_IP = 1U << 0 */
+ PBF_TERM_TID = PBF_TERM_SAMPLE_START + 1, /* SAMPLE_TID = 1U << 1 */
+ PBF_TERM_TIME = PBF_TERM_SAMPLE_START + 2, /* SAMPLE_TIME = 1U << 2 */
+ PBF_TERM_ADDR = PBF_TERM_SAMPLE_START + 3, /* SAMPLE_ADDR = 1U << 3 */
+ __PBF_UNUSED_TERM4 = PBF_TERM_SAMPLE_START + 4, /* SAMPLE_READ = 1U << 4 */
+ __PBF_UNUSED_TERM5 = PBF_TERM_SAMPLE_START + 5, /* SAMPLE_CALLCHAIN = 1U << 5 */
+ PBF_TERM_ID = PBF_TERM_SAMPLE_START + 6, /* SAMPLE_ID = 1U << 6 */
+ PBF_TERM_CPU = PBF_TERM_SAMPLE_START + 7, /* SAMPLE_CPU = 1U << 7 */
+ PBF_TERM_PERIOD = PBF_TERM_SAMPLE_START + 8, /* SAMPLE_PERIOD = 1U << 8 */
+ __PBF_UNUSED_TERM9 = PBF_TERM_SAMPLE_START + 9, /* SAMPLE_STREAM_ID = 1U << 9 */
+ __PBF_UNUSED_TERM10 = PBF_TERM_SAMPLE_START + 10, /* SAMPLE_RAW = 1U << 10 */
+ __PBF_UNUSED_TERM11 = PBF_TERM_SAMPLE_START + 11, /* SAMPLE_BRANCH_STACK = 1U << 11 */
+ __PBF_UNUSED_TERM12 = PBF_TERM_SAMPLE_START + 12, /* SAMPLE_REGS_USER = 1U << 12 */
+ __PBF_UNUSED_TERM13 = PBF_TERM_SAMPLE_START + 13, /* SAMPLE_STACK_USER = 1U << 13 */
+ PBF_TERM_WEIGHT = PBF_TERM_SAMPLE_START + 14, /* SAMPLE_WEIGHT = 1U << 14 */
+ PBF_TERM_DATA_SRC = PBF_TERM_SAMPLE_START + 15, /* SAMPLE_DATA_SRC = 1U << 15 */
+ __PBF_UNUSED_TERM16 = PBF_TERM_SAMPLE_START + 16, /* SAMPLE_IDENTIFIER = 1U << 16 */
+ PBF_TERM_TRANSACTION = PBF_TERM_SAMPLE_START + 17, /* SAMPLE_TRANSACTION = 1U << 17 */
+ __PBF_UNUSED_TERM18 = PBF_TERM_SAMPLE_START + 18, /* SAMPLE_REGS_INTR = 1U << 18 */
+ PBF_TERM_PHYS_ADDR = PBF_TERM_SAMPLE_START + 19, /* SAMPLE_PHYS_ADDR = 1U << 19 */
+ __PBF_UNUSED_TERM20 = PBF_TERM_SAMPLE_START + 20, /* SAMPLE_AUX = 1U << 20 */
+ __PBF_UNUSED_TERM21 = PBF_TERM_SAMPLE_START + 21, /* SAMPLE_CGROUP = 1U << 21 */
+ PBF_TERM_DATA_PAGE_SIZE = PBF_TERM_SAMPLE_START + 22, /* SAMPLE_DATA_PAGE_SIZE = 1U << 22 */
+ PBF_TERM_CODE_PAGE_SIZE = PBF_TERM_SAMPLE_START + 23, /* SAMPLE_CODE_PAGE_SIZE = 1U << 23 */
+ PBF_TERM_WEIGHT_STRUCT = PBF_TERM_SAMPLE_START + 24, /* SAMPLE_WEIGHT_STRUCT = 1U << 24 */
+ PBF_TERM_SAMPLE_END = PBF_TERM_WEIGHT_STRUCT,
+};
+
/* BPF map entry for filtering */
struct perf_bpf_filter_entry {
enum perf_bpf_filter_op op;
__u32 part; /* sub-sample type info when it has multiple values */
- __u64 flags; /* perf sample type flags */
+ enum perf_bpf_filter_term term;
__u64 value;
};
-#endif /* PERF_UTIL_BPF_SKEL_SAMPLE_FILTER_H */
\ No newline at end of file
+#endif /* PERF_UTIL_BPF_SKEL_SAMPLE_FILTER_H */
diff --git a/tools/perf/util/bpf_skel/sample_filter.bpf.c b/tools/perf/util/bpf_skel/sample_filter.bpf.c
index fb94f5280626..5ac1778ff66e 100644
--- a/tools/perf/util/bpf_skel/sample_filter.bpf.c
+++ b/tools/perf/util/bpf_skel/sample_filter.bpf.c
@@ -48,31 +48,54 @@ static inline __u64 perf_get_sample(struct bpf_perf_event_data_kern *kctx,
{
struct perf_sample_data___new *data = (void *)kctx->data;
- if (!bpf_core_field_exists(data->sample_flags) ||
- (data->sample_flags & entry->flags) == 0)
+ if (!bpf_core_field_exists(data->sample_flags))
return 0;
- switch (entry->flags) {
- case PERF_SAMPLE_IP:
+#define BUILD_CHECK_SAMPLE(x) \
+ _Static_assert((1 << (PBF_TERM_##x - PBF_TERM_SAMPLE_START)) == PERF_SAMPLE_##x, \
+ "Mismatched PBF term to sample bit " #x)
+ BUILD_CHECK_SAMPLE(IP);
+ BUILD_CHECK_SAMPLE(TID);
+ BUILD_CHECK_SAMPLE(TIME);
+ BUILD_CHECK_SAMPLE(ADDR);
+ BUILD_CHECK_SAMPLE(ID);
+ BUILD_CHECK_SAMPLE(CPU);
+ BUILD_CHECK_SAMPLE(PERIOD);
+ BUILD_CHECK_SAMPLE(WEIGHT);
+ BUILD_CHECK_SAMPLE(DATA_SRC);
+ BUILD_CHECK_SAMPLE(TRANSACTION);
+ BUILD_CHECK_SAMPLE(PHYS_ADDR);
+ BUILD_CHECK_SAMPLE(DATA_PAGE_SIZE);
+ BUILD_CHECK_SAMPLE(CODE_PAGE_SIZE);
+ BUILD_CHECK_SAMPLE(WEIGHT_STRUCT);
+#undef BUILD_CHECK_SAMPLE
+
+ /* For sample terms check the sample bit is set. */
+ if (entry->term >= PBF_TERM_SAMPLE_START && entry->term <= PBF_TERM_SAMPLE_END &&
+ (data->sample_flags & (1 << (entry->term - PBF_TERM_SAMPLE_START))) == 0)
+ return 0;
+
+ switch (entry->term) {
+ case PBF_TERM_IP:
return kctx->data->ip;
- case PERF_SAMPLE_ID:
+ case PBF_TERM_ID:
return kctx->data->id;
- case PERF_SAMPLE_TID:
+ case PBF_TERM_TID:
if (entry->part)
return kctx->data->tid_entry.pid;
else
return kctx->data->tid_entry.tid;
- case PERF_SAMPLE_CPU:
+ case PBF_TERM_CPU:
return kctx->data->cpu_entry.cpu;
- case PERF_SAMPLE_TIME:
+ case PBF_TERM_TIME:
return kctx->data->time;
- case PERF_SAMPLE_ADDR:
+ case PBF_TERM_ADDR:
return kctx->data->addr;
- case PERF_SAMPLE_PERIOD:
+ case PBF_TERM_PERIOD:
return kctx->data->period;
- case PERF_SAMPLE_TRANSACTION:
+ case PBF_TERM_TRANSACTION:
return kctx->data->txn;
- case PERF_SAMPLE_WEIGHT_STRUCT:
+ case PBF_TERM_WEIGHT_STRUCT:
if (entry->part == 1)
return kctx->data->weight.var1_dw;
if (entry->part == 2)
@@ -80,15 +103,15 @@ static inline __u64 perf_get_sample(struct bpf_perf_event_data_kern *kctx,
if (entry->part == 3)
return kctx->data->weight.var3_w;
/* fall through */
- case PERF_SAMPLE_WEIGHT:
+ case PBF_TERM_WEIGHT:
return kctx->data->weight.full;
- case PERF_SAMPLE_PHYS_ADDR:
+ case PBF_TERM_PHYS_ADDR:
return kctx->data->phys_addr;
- case PERF_SAMPLE_CODE_PAGE_SIZE:
+ case PBF_TERM_CODE_PAGE_SIZE:
return kctx->data->code_page_size;
- case PERF_SAMPLE_DATA_PAGE_SIZE:
+ case PBF_TERM_DATA_PAGE_SIZE:
return kctx->data->data_page_size;
- case PERF_SAMPLE_DATA_SRC:
+ case PBF_TERM_DATA_SRC:
if (entry->part == 1)
return kctx->data->data_src.mem_op;
if (entry->part == 2)
@@ -117,6 +140,18 @@ static inline __u64 perf_get_sample(struct bpf_perf_event_data_kern *kctx,
}
/* return the whole word */
return kctx->data->data_src.val;
+ case PBF_TERM_NONE:
+ case __PBF_UNUSED_TERM4:
+ case __PBF_UNUSED_TERM5:
+ case __PBF_UNUSED_TERM9:
+ case __PBF_UNUSED_TERM10:
+ case __PBF_UNUSED_TERM11:
+ case __PBF_UNUSED_TERM12:
+ case __PBF_UNUSED_TERM13:
+ case __PBF_UNUSED_TERM16:
+ case __PBF_UNUSED_TERM18:
+ case __PBF_UNUSED_TERM20:
+ case __PBF_UNUSED_TERM21:
default:
break;
}
--
2.45.1.288.g0e0cd299f1-goog
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