xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

sunrpc: Add tracing for cache events

Browse Source 
Add basic tracing for debugging the sunrpc cache events.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Trond Myklebust
2020-03-01 18:21:44 -05:00
committed by Chuck Lever
parent 277f27e2f2
commit 78a947f50a
2 changed files with 60 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
net/sunrpc/cache.c
View File

@@ -32,6 +32,7 @@
#include <linux/sunrpc/cache.h>
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
#include <trace/events/sunrpc.h>
#include "netns.h"
#define RPCDBG_FACILITY RPCDBG_CACHE
@@ -120,6 +121,7 @@ static struct cache_head *sunrpc_cache_add_entry(struct cache_detail *detail,
if (test_bit(CACHE_VALID, &tmp->flags) &&
cache_is_expired(detail, tmp)) {
sunrpc_begin_cache_remove_entry(tmp, detail);
trace_cache_entry_expired(detail, tmp);
freeme = tmp;
break;
}
@@ -176,6 +178,25 @@ static void cache_fresh_unlocked(struct cache_head *head,
}
}
static void cache_make_negative(struct cache_detail *detail,
struct cache_head *h)
{
set_bit(CACHE_NEGATIVE, &h->flags);
trace_cache_entry_make_negative(detail, h);
}
static void cache_entry_update(struct cache_detail *detail,
struct cache_head *h,
struct cache_head *new)
{
if (!test_bit(CACHE_NEGATIVE, &new->flags)) {
detail->update(h, new);
trace_cache_entry_update(detail, h);
} else {
cache_make_negative(detail, h);
}
}
struct cache_head *sunrpc_cache_update(struct cache_detail *detail,
struct cache_head *new, struct cache_head *old, int hash)
{
@@ -188,10 +209,7 @@ struct cache_head *sunrpc_cache_update(struct cache_detail *detail,
if (!test_bit(CACHE_VALID, &old->flags)) {
spin_lock(&detail->hash_lock);
if (!test_bit(CACHE_VALID, &old->flags)) {
if (test_bit(CACHE_NEGATIVE, &new->flags))
set_bit(CACHE_NEGATIVE, &old->flags);
else
detail->update(old, new);
cache_entry_update(detail, old, new);
cache_fresh_locked(old, new->expiry_time, detail);
spin_unlock(&detail->hash_lock);
cache_fresh_unlocked(old, detail);
@@ -209,10 +227,7 @@ struct cache_head *sunrpc_cache_update(struct cache_detail *detail,
detail->init(tmp, old);
spin_lock(&detail->hash_lock);
if (test_bit(CACHE_NEGATIVE, &new->flags))
set_bit(CACHE_NEGATIVE, &tmp->flags);
else
detail->update(tmp, new);
cache_entry_update(detail, tmp, new);
hlist_add_head(&tmp->cache_list, &detail->hash_table[hash]);
detail->entries++;
cache_get(tmp);
@@ -254,7 +269,7 @@ static int try_to_negate_entry(struct cache_detail *detail, struct cache_head *h
spin_lock(&detail->hash_lock);
rv = cache_is_valid(h);
if (rv == -EAGAIN) {
set_bit(CACHE_NEGATIVE, &h->flags);
cache_make_negative(detail, h);
cache_fresh_locked(h, seconds_since_boot()+CACHE_NEW_EXPIRY,
detail);
rv = -ENOENT;
@@ -460,6 +475,7 @@ static int cache_clean(void)
continue;
sunrpc_begin_cache_remove_entry(ch, current_detail);
trace_cache_entry_expired(current_detail, ch);
rv = 1;
break;
}
@@ -1215,6 +1231,7 @@ static int cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h)
if (test_bit(CACHE_PENDING, &h->flags)) {
crq->item = cache_get(h);
list_add_tail(&crq->q.list, &detail->queue);
trace_cache_entry_upcall(detail, h);
} else
/* Lost a race, no longer PENDING, so don't enqueue */
ret = -EAGAIN;
@@ -1240,6 +1257,7 @@ int sunrpc_cache_pipe_upcall_timeout(struct cache_detail *detail,
{
if (!cache_listeners_exist(detail)) {
warn_no_listener(detail);
trace_cache_entry_no_listener(detail, h);
return -EINVAL;
}
return sunrpc_cache_pipe_upcall(detail, h);