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Merge tag 'perf-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull perf fixes from Thomas Gleixner:
 "Three fixes/updates for perf:

   - Fix the perf event cgroup tracking which tries to track the cgroup
     even for disabled events.

   - Add Ice Lake server support for uncore events

   - Disable pagefaults when retrieving the physical address in the
     sampling code"

* tag 'perf-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Disable page faults when getting phys address
  perf/x86/intel/uncore: Add Ice Lake server uncore support
  perf/cgroup: Correct indirection in perf_less_group_idx()
  perf/core: Fix event cgroup tracking
This commit is contained in:
Linus Torvalds
2020-04-12 10:05:24 -07:00
parent 652fa53caa d3296fb372
commit 20e2aa8126
4 changed files with 574 additions and 32 deletions
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84
kernel/events/core.c
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@@ -983,16 +983,10 @@ perf_cgroup_set_shadow_time(struct perf_event *event, u64 now)
event->shadow_ctx_time = now - t->timestamp;
}
/*
* Update cpuctx->cgrp so that it is set when first cgroup event is added and
* cleared when last cgroup event is removed.
*/
static inline void
list_update_cgroup_event(struct perf_event *event,
struct perf_event_context *ctx, bool add)
perf_cgroup_event_enable(struct perf_event *event, struct perf_event_context *ctx)
{
struct perf_cpu_context *cpuctx;
struct list_head *cpuctx_entry;
if (!is_cgroup_event(event))
return;
@@ -1009,28 +1003,41 @@ list_update_cgroup_event(struct perf_event *event,
* because if the first would mismatch, the second would not try again
* and we would leave cpuctx->cgrp unset.
*/
if (add && !cpuctx->cgrp) {
if (ctx->is_active && !cpuctx->cgrp) {
struct perf_cgroup *cgrp = perf_cgroup_from_task(current, ctx);
if (cgroup_is_descendant(cgrp->css.cgroup, event->cgrp->css.cgroup))
cpuctx->cgrp = cgrp;
}
if (add && ctx->nr_cgroups++)
return;
else if (!add && --ctx->nr_cgroups)
if (ctx->nr_cgroups++)
return;
/* no cgroup running */
if (!add)
list_add(&cpuctx->cgrp_cpuctx_entry,
per_cpu_ptr(&cgrp_cpuctx_list, event->cpu));
}
static inline void
perf_cgroup_event_disable(struct perf_event *event, struct perf_event_context *ctx)
{
struct perf_cpu_context *cpuctx;
if (!is_cgroup_event(event))
return;
/*
* Because cgroup events are always per-cpu events,
* @ctx == &cpuctx->ctx.
*/
cpuctx = container_of(ctx, struct perf_cpu_context, ctx);
if (--ctx->nr_cgroups)
return;
if (ctx->is_active && cpuctx->cgrp)
cpuctx->cgrp = NULL;
cpuctx_entry = &cpuctx->cgrp_cpuctx_entry;
if (add)
list_add(cpuctx_entry,
per_cpu_ptr(&cgrp_cpuctx_list, event->cpu));
else
list_del(cpuctx_entry);
list_del(&cpuctx->cgrp_cpuctx_entry);
}
#else /* !CONFIG_CGROUP_PERF */
@@ -1096,11 +1103,14 @@ static inline u64 perf_cgroup_event_time(struct perf_event *event)
}
static inline void
list_update_cgroup_event(struct perf_event *event,
struct perf_event_context *ctx, bool add)
perf_cgroup_event_enable(struct perf_event *event, struct perf_event_context *ctx)
{
}
static inline void
perf_cgroup_event_disable(struct perf_event *event, struct perf_event_context *ctx)
{
}
#endif
/*
@@ -1791,13 +1801,14 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
add_event_to_groups(event, ctx);
}
list_update_cgroup_event(event, ctx, true);
list_add_rcu(&event->event_entry, &ctx->event_list);
ctx->nr_events++;
if (event->attr.inherit_stat)
ctx->nr_stat++;
if (event->state > PERF_EVENT_STATE_OFF)
perf_cgroup_event_enable(event, ctx);
ctx->generation++;
}
@@ -1976,8 +1987,6 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx)
event->attach_state &= ~PERF_ATTACH_CONTEXT;
list_update_cgroup_event(event, ctx, false);
ctx->nr_events--;
if (event->attr.inherit_stat)
ctx->nr_stat--;
@@ -1994,8 +2003,10 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx)
* of error state is by explicit re-enabling
* of the event
*/
if (event->state > PERF_EVENT_STATE_OFF)
if (event->state > PERF_EVENT_STATE_OFF) {
perf_cgroup_event_disable(event, ctx);
perf_event_set_state(event, PERF_EVENT_STATE_OFF);
}
ctx->generation++;
}
@@ -2226,6 +2237,7 @@ event_sched_out(struct perf_event *event,
if (READ_ONCE(event->pending_disable) >= 0) {
WRITE_ONCE(event->pending_disable, -1);
perf_cgroup_event_disable(event, ctx);
state = PERF_EVENT_STATE_OFF;
}
perf_event_set_state(event, state);
@@ -2363,6 +2375,7 @@ static void __perf_event_disable(struct perf_event *event,
event_sched_out(event, cpuctx, ctx);
perf_event_set_state(event, PERF_EVENT_STATE_OFF);
perf_cgroup_event_disable(event, ctx);
}
/*
@@ -2746,7 +2759,7 @@ static int __perf_install_in_context(void *info)
}
#ifdef CONFIG_CGROUP_PERF
if (is_cgroup_event(event)) {
if (event->state > PERF_EVENT_STATE_OFF && is_cgroup_event(event)) {
/*
* If the current cgroup doesn't match the event's
* cgroup, we should not try to schedule it.
@@ -2906,6 +2919,7 @@ static void __perf_event_enable(struct perf_event *event,
ctx_sched_out(ctx, cpuctx, EVENT_TIME);
perf_event_set_state(event, PERF_EVENT_STATE_INACTIVE);
perf_cgroup_event_enable(event, ctx);
if (!ctx->is_active)
return;
@@ -3508,7 +3522,8 @@ static void cpu_ctx_sched_out(struct perf_cpu_context *cpuctx,
static bool perf_less_group_idx(const void *l, const void *r)
{
const struct perf_event *le = l, *re = r;
const struct perf_event *le = *(const struct perf_event **)l;
const struct perf_event *re = *(const struct perf_event **)r;
return le->group_index < re->group_index;
}
@@ -3616,8 +3631,10 @@ static int merge_sched_in(struct perf_event *event, void *data)
}
if (event->state == PERF_EVENT_STATE_INACTIVE) {
if (event->attr.pinned)
if (event->attr.pinned) {
perf_cgroup_event_disable(event, ctx);
perf_event_set_state(event, PERF_EVENT_STATE_ERROR);
}
*can_add_hw = 0;
ctx->rotate_necessary = 1;
@@ -6917,9 +6934,12 @@ static u64 perf_virt_to_phys(u64 virt)
* Try IRQ-safe __get_user_pages_fast first.
* If failed, leave phys_addr as 0.
*/
if ((current->mm != NULL) &&
(__get_user_pages_fast(virt, 1, 0, &p) == 1))
phys_addr = page_to_phys(p) + virt % PAGE_SIZE;
if (current->mm != NULL) {
pagefault_disable();
if (__get_user_pages_fast(virt, 1, 0, &p) == 1)
phys_addr = page_to_phys(p) + virt % PAGE_SIZE;
pagefault_enable();
}
if (p)
put_page(p);