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Kirill Smelkov
bcc
Commits
9de830ae
Commit
9de830ae
authored
7 years ago
by
4ast
Committed by
GitHub
7 years ago
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Merge pull request #1294 from iovisor/yhs_dev
avoid large map memory allocation in userspace
parents
47305f47
067219b2
Changes
2
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2 changed files
with
14 additions
and
8 deletions
+14
-8
src/cc/export/helpers.h
src/cc/export/helpers.h
+6
-6
src/cc/frontends/clang/b_frontend_action.cc
src/cc/frontends/clang/b_frontend_action.cc
+8
-2
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src/cc/export/helpers.h
View file @
9de830ae
...
...
@@ -50,11 +50,11 @@ struct _name##_table_t { \
void (*call) (void *, int index); \
void (*increment) (_key_type); \
int (*get_stackid) (void *, u64); \
_leaf_type data[_max_entries]
; \
u32 max_entries
; \
int flags; \
}; \
__attribute__((section("
maps
/
" _table_type))) \
struct _name##_table_t _name = { .flags = (_flags) }
struct _name##_table_t _name = { .flags = (_flags)
, .max_entries = (_max_entries)
}
#define BPF_TABLE(_table_type, _key_type, _leaf_type, _name, _max_entries) \
BPF_F_TABLE(_table_type, _key_type, _leaf_type, _name, _max_entries, 0)
...
...
@@ -84,10 +84,10 @@ struct _name##_table_t { \
/* map.perf_submit(ctx, data, data_size) */ \
int (*perf_submit) (void *, void *, u32); \
int (*perf_submit_skb) (void *, u32, void *, u32); \
u32
data[0]
; \
u32
max_entries
; \
}; \
__attribute__((section("
maps
/
perf_output
"))) \
struct _name##_table_t _name
struct _name##_table_t _name
= { .max_entries = 0 }
// Table for reading hw perf cpu counters
#define BPF_PERF_ARRAY(_name, _max_entries) \
...
...
@@ -96,10 +96,10 @@ struct _name##_table_t { \
u32 leaf; \
/* counter = map.perf_read(index) */ \
u64 (*perf_read) (int); \
u32
data[_max_entries]
; \
u32
max_entries
; \
}; \
__attribute__((section("
maps
/
perf_array
"))) \
struct _name##_table_t _name
struct _name##_table_t _name
= { .max_entries = (_max_entries) }
#define BPF_HASH1(_name) \
BPF_TABLE("
hash
", u64, u64, _name, 10240)
...
...
This diff is collapsed.
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src/cc/frontends/clang/b_frontend_action.cc
View file @
9de830ae
...
...
@@ -633,8 +633,14 @@ bool BTypeVisitor::VisitVarDecl(VarDecl *Decl) {
}
table
.
leaf_size
=
sz
;
leaf_type
=
F
->
getType
();
}
else
if
(
F
->
getName
()
==
"data"
)
{
table
.
max_entries
=
sz
/
table
.
leaf_size
;
}
else
if
(
F
->
getName
()
==
"max_entries"
)
{
unsigned
idx
=
F
->
getFieldIndex
();
if
(
auto
I
=
dyn_cast_or_null
<
InitListExpr
>
(
Decl
->
getInit
()))
{
llvm
::
APSInt
res
;
if
(
I
->
getInit
(
idx
)
->
EvaluateAsInt
(
res
,
C
))
{
table
.
max_entries
=
res
.
getExtValue
();
}
}
}
else
if
(
F
->
getName
()
==
"flags"
)
{
unsigned
idx
=
F
->
getFieldIndex
();
if
(
auto
I
=
dyn_cast_or_null
<
InitListExpr
>
(
Decl
->
getInit
()))
{
...
...
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