UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

perf/core: Change the layout of perf_sample_data 

The layout of perf_sample_data is designed to minimize cache-line
access.  The perf_sample_data_init() used to initialize a couple of
fields unconditionally so they were placed together at the head.

But it's changed now to set the fields according to the actual
sample_type flags.  The main user (the perf tools) sets the IP, TID,
TIME, PERIOD always.  Also group relevant fields like addr, phys_addr
and data_page_size.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20221229204101.1099430-1-namhyung@kernel.org
This commit is contained in:
Namhyung Kim 2022-12-29 12:40:59 -08:00 committed by Ingo Molnar
parent b0bd3336d8
commit 7bdb1767bf
1 changed files with 19 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
include/linux/perf_event.h
View File

@ -1098,47 +1098,51 @@ extern u64 perf_event_read_value(struct perf_event *event,
struct perf_sample_data {
/*
* Fields set by perf_sample_data_init(), group so as to
* minimize the cachelines touched.
* Fields set by perf_sample_data_init() unconditionally,
* group so as to minimize the cachelines touched.
*/
u64 sample_flags;
u64 period;
/*
* The other fields, optionally {set,used} by
* perf_{prepare,output}_sample().
* Fields commonly set by __perf_event_header__init_id(),
* group so as to minimize the cachelines touched.
*/
struct perf_branch_stack *br_stack;
union perf_sample_weight weight;
union perf_mem_data_src data_src;
u64 txn;
u64 addr;
struct perf_raw_record *raw;
u64 type;
u64 ip;
struct {
u32 pid;
u32 tid;
} tid_entry;
u64 time;
u64 id;
u64 stream_id;
struct {
u32 cpu;
u32 reserved;
} cpu_entry;
/*
* The other fields, optionally {set,used} by
* perf_{prepare,output}_sample().
*/
u64 ip;
struct perf_callchain_entry *callchain;
u64 aux_size;
struct perf_raw_record *raw;
struct perf_branch_stack *br_stack;
union perf_sample_weight weight;
union perf_mem_data_src data_src;
u64 txn;
struct perf_regs regs_user;
struct perf_regs regs_intr;
u64 stack_user_size;
u64 phys_addr;
u64 stream_id;
u64 cgroup;
u64 addr;
u64 phys_addr;
u64 data_page_size;
u64 code_page_size;
u64 aux_size;
} ____cacheline_aligned;
/* default value for data source */