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charset="UTF-8" close_data_fd() and dso__list_del() only operate on struct dso_data fields, while close_first_dso() retrieves a struct dso_data * from dso__data_open. Pass struct dso_data * directly to close_data_fd() and dso__list_del() so close_first_dso() does not need to recover a struct dso * from struct dso_data *. This removes the REFCNT_CHECKING dso pointer from struct dso_data and avoids dropping _dso__data_open_lock in dso__list_del() to call dso__put(), preventing lock-order inversions and races during EMFILE eviction. Signed-off-by: Ian Rogers --- tools/perf/util/dso.c | 44 ++++++++++++------------------------------- tools/perf/util/dso.h | 3 --- 2 files changed, 12 insertions(+), 35 deletions(-) diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c index 24ff066b9878..cbc4f30e7f23 100644 --- a/tools/perf/util/dso.c +++ b/tools/perf/util/dso.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #include "dso.h" +#include #include #include @@ -544,22 +545,14 @@ static struct mutex *dso__data_open_lock(void) __returns_ctx_lock(&_dso__data_op static void dso__list_add(struct dso *dso) __must_hold(&_dso__data_open_lock) { list_add_tail(&dso__data(dso)->open_entry, &dso__data_open); -#ifdef REFCNT_CHECKING - dso__data(dso)->dso = dso__get(dso); -#endif - /* Assume the dso is part of dsos, hence the optional reference count above. */ + /* Assume the dso is part of dsos, holding it live while on dso__data_open. */ assert(dso__dsos(dso)); dso__data_open_cnt++; } -static void dso__list_del(struct dso *dso) __must_hold(&_dso__data_open_lock) +static void dso__list_del(struct dso_data *dso_data) __must_hold(&_dso__data_open_lock) { - list_del_init(&dso__data(dso)->open_entry); -#ifdef REFCNT_CHECKING - mutex_unlock(dso__data_open_lock()); - dso__put(dso__data(dso)->dso); - mutex_lock(dso__data_open_lock()); -#endif + list_del_init(&dso_data->open_entry); WARN_ONCE(dso__data_open_cnt <= 0, "DSO data fd counter out of bounds."); dso__data_open_cnt--; @@ -729,13 +722,13 @@ static int open_dso(struct dso *dso, struct machine *machine) return fd; } -static void close_data_fd(struct dso *dso) __must_hold(&_dso__data_open_lock) +static void close_data_fd(struct dso_data *dso_data) __must_hold(&_dso__data_open_lock) { - if (dso__data(dso)->fd >= 0) { - close(dso__data(dso)->fd); - dso__data(dso)->fd = -1; - dso__data(dso)->file_size = 0; - dso__list_del(dso); + if (dso_data->fd >= 0) { + close(dso_data->fd); + dso_data->fd = -1; + dso_data->file_size = 0; + dso__list_del(dso_data); } } @@ -748,21 +741,15 @@ static void close_data_fd(struct dso *dso) __must_hold(&_dso__data_open_lock) */ static void close_dso(struct dso *dso) __must_hold(&_dso__data_open_lock) { - close_data_fd(dso); + close_data_fd(dso__data(dso)); } static void close_first_dso(void) __must_hold(&_dso__data_open_lock) { struct dso_data *dso_data; - struct dso *dso; dso_data = list_first_entry(&dso__data_open, struct dso_data, open_entry); -#ifdef REFCNT_CHECKING - dso = dso_data->dso; -#else - dso = container_of(dso_data, struct dso, data); -#endif - close_dso(dso); + close_data_fd(dso_data); } static rlim_t get_fd_limit(void) @@ -1858,9 +1845,6 @@ struct dso *dso__new_id(const char *name, const struct dso_id *id) data->fd = -1; data->status = DSO_DATA_STATUS_UNKNOWN; INIT_LIST_HEAD(&data->open_entry); -#ifdef REFCNT_CHECKING - data->dso = NULL; /* Set when on the open_entry list. */ -#endif } return res; } @@ -1918,10 +1902,6 @@ struct dso *dso__get(struct dso *dso) void dso__put(struct dso *dso) { -#ifdef REFCNT_CHECKING - if (dso && dso__data(dso) && refcount_read(&RC_CHK_ACCESS(dso)->refcnt) == 2) - dso__data_close(dso); -#endif if (dso && refcount_dec_and_test(&RC_CHK_ACCESS(dso)->refcnt)) dso__delete(dso); else diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h index f6c60bafcde1..0c18c0f3ef88 100644 --- a/tools/perf/util/dso.h +++ b/tools/perf/util/dso.h @@ -261,9 +261,6 @@ struct dso_cache { struct dso_data { struct rb_root cache; struct list_head open_entry; -#ifdef REFCNT_CHECKING - struct dso *dso; -#endif int fd; int status; u32 status_seen; -- 2.56.0.455.g6c5a503b38-goog