diff options
Diffstat (limited to 'tools/perf/util/dso.c')
| -rw-r--r-- | tools/perf/util/dso.c | 61 |
1 files changed, 59 insertions, 2 deletions
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c index 76e5c13afc8..fbf6cc98b8a 100644 --- a/tools/perf/util/dso.c +++ b/tools/perf/util/dso.c @@ -1,4 +1,6 @@ #include <asm/bug.h> +#include <sys/time.h> +#include <sys/resource.h> #include "symbol.h" #include "dso.h" #include "machine.h" @@ -180,12 +182,20 @@ static int __open_dso(struct dso *dso, struct machine *machine) return fd; } +static void check_data_close(void); + static int open_dso(struct dso *dso, struct machine *machine) { int fd = __open_dso(dso, machine); - if (fd > 0) + if (fd > 0) { dso__list_add(dso); + /* + * Check if we crossed the allowed number + * of opened DSOs and close one if needed. + */ + check_data_close(); + } return fd; } @@ -204,6 +214,54 @@ static void close_dso(struct dso *dso) close_data_fd(dso); } +static void close_first_dso(void) +{ + struct dso *dso; + + dso = list_first_entry(&dso__data_open, struct dso, data.open_entry); + close_dso(dso); +} + +static rlim_t get_fd_limit(void) +{ + struct rlimit l; + rlim_t limit = 0; + + /* Allow half of the current open fd limit. */ + if (getrlimit(RLIMIT_NOFILE, &l) == 0) { + if (l.rlim_cur == RLIM_INFINITY) + limit = l.rlim_cur; + else + limit = l.rlim_cur / 2; + } else { + pr_err("failed to get fd limit\n"); + limit = 1; + } + + return limit; +} + +static bool may_cache_fd(void) +{ + static rlim_t limit; + + if (!limit) + limit = get_fd_limit(); + + if (limit == RLIM_INFINITY) + return true; + + return limit > (rlim_t) dso__data_open_cnt; +} + +static void check_data_close(void) +{ + bool cache_fd = may_cache_fd(); + + if (!cache_fd) + close_first_dso(); +} + void dso__data_close(struct dso *dso) { close_dso(dso); @@ -356,7 +414,6 @@ dso_cache__read(struct dso *dso, struct machine *machine, if (ret <= 0) free(cache); - dso__data_close(dso); return ret; } |