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authorVadim Lobanov <vlobanov@speakeasy.net>2006-12-10 05:21:12 -0500
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-10 12:57:22 -0500
commitbbea9f69668a3d0cf9feba15a724cd02896f8675 (patch)
treebc58506e4daba4a04309181a5501ae4eb5424783 /fs/open.c
parentf3d19c90fb117a5f080310a4592929aa8e1ad8e9 (diff)
[PATCH] fdtable: Make fdarray and fdsets equal in size
Currently, each fdtable supports three dynamically-sized arrays of data: the fdarray and two fdsets. The code allows the number of fds supported by the fdarray (fdtable->max_fds) to differ from the number of fds supported by each of the fdsets (fdtable->max_fdset). In practice, it is wasteful for these two sizes to differ: whenever we hit a limit on the smaller-capacity structure, we will reallocate the entire fdtable and all the dynamic arrays within it, so any delta in the memory used by the larger-capacity structure will never be touched at all. Rather than hogging this excess, we shouldn't even allocate it in the first place, and keep the capacities of the fdarray and the fdsets equal. This patch removes fdtable->max_fdset. As an added bonus, most of the supporting code becomes simpler. Signed-off-by: Vadim Lobanov <vlobanov@speakeasy.net> Cc: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Dipankar Sarma <dipankar@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/open.c')
-rw-r--r--fs/open.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/open.c b/fs/open.c
index 0d94319e8681..c989fb4cf7b9 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -864,8 +864,7 @@ int get_unused_fd(void)
864 864
865repeat: 865repeat:
866 fdt = files_fdtable(files); 866 fdt = files_fdtable(files);
867 fd = find_next_zero_bit(fdt->open_fds->fds_bits, 867 fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fds,
868 fdt->max_fdset,
869 files->next_fd); 868 files->next_fd);
870 869
871 /* 870 /*