lkml.org 
[lkml]   [2019]   [Aug]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v0 1/6] perf/x86/intel/pt: Clean up ToPA allocation path
Date
Some of the allocation parameters are passed as function arguments,
while the CPU number for per-cpu allocation is passed via the buffer
object. There's no reason for this.

Pass the CPU as a function argument instead.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
---
arch/x86/events/intel/pt.c | 15 +++++++--------
arch/x86/events/intel/pt.h | 2 --
2 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
index a7318c29242e..b029f32edae2 100644
--- a/arch/x86/events/intel/pt.c
+++ b/arch/x86/events/intel/pt.c
@@ -670,7 +670,7 @@ static bool topa_table_full(struct topa *topa)
*
* Return: 0 on success or error code.
*/
-static int topa_insert_pages(struct pt_buffer *buf, gfp_t gfp)
+static int topa_insert_pages(struct pt_buffer *buf, int cpu, gfp_t gfp)
{
struct topa *topa = buf->last;
int order = 0;
@@ -681,7 +681,7 @@ static int topa_insert_pages(struct pt_buffer *buf, gfp_t gfp)
order = page_private(p);

if (topa_table_full(topa)) {
- topa = topa_alloc(buf->cpu, gfp);
+ topa = topa_alloc(cpu, gfp);
if (!topa)
return -ENOMEM;

@@ -1061,20 +1061,20 @@ static void pt_buffer_fini_topa(struct pt_buffer *buf)
* @size: Total size of all regions within this ToPA.
* @gfp: Allocation flags.
*/
-static int pt_buffer_init_topa(struct pt_buffer *buf, unsigned long nr_pages,
- gfp_t gfp)
+static int pt_buffer_init_topa(struct pt_buffer *buf, int cpu,
+ unsigned long nr_pages, gfp_t gfp)
{
struct topa *topa;
int err;

- topa = topa_alloc(buf->cpu, gfp);
+ topa = topa_alloc(cpu, gfp);
if (!topa)
return -ENOMEM;

topa_insert_table(buf, topa);

while (buf->nr_pages < nr_pages) {
- err = topa_insert_pages(buf, gfp);
+ err = topa_insert_pages(buf, cpu, gfp);
if (err) {
pt_buffer_fini_topa(buf);
return -ENOMEM;
@@ -1124,13 +1124,12 @@ pt_buffer_setup_aux(struct perf_event *event, void **pages,
if (!buf)
return NULL;

- buf->cpu = cpu;
buf->snapshot = snapshot;
buf->data_pages = pages;

INIT_LIST_HEAD(&buf->tables);

- ret = pt_buffer_init_topa(buf, nr_pages, GFP_KERNEL);
+ ret = pt_buffer_init_topa(buf, cpu, nr_pages, GFP_KERNEL);
if (ret) {
kfree(buf);
return NULL;
diff --git a/arch/x86/events/intel/pt.h b/arch/x86/events/intel/pt.h
index 63fe4063fbd6..8de8ed089697 100644
--- a/arch/x86/events/intel/pt.h
+++ b/arch/x86/events/intel/pt.h
@@ -53,7 +53,6 @@ struct pt_pmu {
/**
* struct pt_buffer - buffer configuration; one buffer per task_struct or
* cpu, depending on perf event configuration
- * @cpu: cpu for per-cpu allocation
* @tables: list of ToPA tables in this buffer
* @first: shorthand for first topa table
* @last: shorthand for last topa table
@@ -71,7 +70,6 @@ struct pt_pmu {
* @topa_index: table of topa entries indexed by page offset
*/
struct pt_buffer {
- int cpu;
struct list_head tables;
struct topa *first, *last, *cur;
unsigned int cur_idx;
--
2.23.0.rc1
\
 
 \ /
  Last update: 2019-08-21 14:49    [W:0.077 / U:8.608 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site