[PATCH] mem: close rtemap files

["huzaifa.rahman" <huzaifa.rahman@emumba.com>]

Bugzilla ID: 560

The memory subsystem is leaving open a file descriptor for each
rtemap file. This can lead to hundreds of extra open file descriptors
which has negative side effects. For example, the application may go
over its maximum file descriptor limit, or the application may be using
limited API's like select that only allow 1024 file descriptors.

The EAL memory subsystem does not need to hold the file open.
Probably the original intention was to keep the file locked, but that is
not necessary. The Linux kernel keeps a reference count on the file,
and the mmap counts is a reference and therefore maintains the file
as locked.

The fix is just to close the file after it is setup.

Signed-off-by: huzaifa.rahman <huzaifa.rahman@emumba.com>
---
 lib/eal/linux/eal_memalloc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/eal/linux/eal_memalloc.c b/lib/eal/linux/eal_memalloc.c
index f8b1588cae..955c4e4f95 100644
--- a/lib/eal/linux/eal_memalloc.c
+++ b/lib/eal/linux/eal_memalloc.c
@@ -679,6 +679,9 @@ alloc_seg(struct rte_memseg *ms, void *addr, int socket_id,
 
 	huge_recover_sigbus();
 
+	close(fd);
+	fd_list[list_idx].fds[seg_idx] = -1;
+
 	ms->addr = addr;
 	ms->hugepage_sz = alloc_sz;
 	ms->len = alloc_sz;
-- 
2.25.1