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Increased block size to 128 and added comments based on feedback from

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Java folks including Oscar Martinez de la Torre <omt@wm.estec.esa.nl>.
This commit is contained in:
Joel Sherrill
2000-02-11 15:54:47 +00:00
parent 35ece2ecb2
commit 562e7ed1ed
4 changed files with 52 additions and 4 deletions
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14
c/src/exec/libfs/src/imfs/imfs.h
View File

@@ -66,9 +66,21 @@ typedef struct {
* *
* block_ptr is a pointer to a block of IMFS_MEMFILE_BYTES_PER_BLOCK in * block_ptr is a pointer to a block of IMFS_MEMFILE_BYTES_PER_BLOCK in
* length which could be data or a table of pointers to blocks. * length which could be data or a table of pointers to blocks.
*
* Setting IMFS_MEMFILE_BYTES_PER_BLOCK to different values has a significant
* impact on the maximum file size supported as well as the amount of
* memory wasted due to internal file fragmentation. The following
* is a list of maximum file sizes based on various settings
*
* max_filesize with blocks of 16 is 1,328
* max_filesize with blocks of 32 is 18,656
* max_filesize with blocks of 64 is 279,488
* max_filesize with blocks of 128 is 4,329,344
* max_filesize with blocks of 256 is 68,173,568
* max_filesize with blocks of 512 is 1,082,195,456
*/ */
#define IMFS_MEMFILE_BYTES_PER_BLOCK 64 /* 512 */ #define IMFS_MEMFILE_BYTES_PER_BLOCK 128
#define IMFS_MEMFILE_BLOCK_SLOTS \ #define IMFS_MEMFILE_BLOCK_SLOTS \
(IMFS_MEMFILE_BYTES_PER_BLOCK / sizeof(void *)) (IMFS_MEMFILE_BYTES_PER_BLOCK / sizeof(void *))

14
c/src/lib/libc/imfs.h
View File

@@ -66,9 +66,21 @@ typedef struct {
* *
* block_ptr is a pointer to a block of IMFS_MEMFILE_BYTES_PER_BLOCK in * block_ptr is a pointer to a block of IMFS_MEMFILE_BYTES_PER_BLOCK in
* length which could be data or a table of pointers to blocks. * length which could be data or a table of pointers to blocks.
*
* Setting IMFS_MEMFILE_BYTES_PER_BLOCK to different values has a significant
* impact on the maximum file size supported as well as the amount of
* memory wasted due to internal file fragmentation. The following
* is a list of maximum file sizes based on various settings
*
* max_filesize with blocks of 16 is 1,328
* max_filesize with blocks of 32 is 18,656
* max_filesize with blocks of 64 is 279,488
* max_filesize with blocks of 128 is 4,329,344
* max_filesize with blocks of 256 is 68,173,568
* max_filesize with blocks of 512 is 1,082,195,456
*/ */
#define IMFS_MEMFILE_BYTES_PER_BLOCK 64 /* 512 */ #define IMFS_MEMFILE_BYTES_PER_BLOCK 128
#define IMFS_MEMFILE_BLOCK_SLOTS \ #define IMFS_MEMFILE_BLOCK_SLOTS \
(IMFS_MEMFILE_BYTES_PER_BLOCK / sizeof(void *)) (IMFS_MEMFILE_BYTES_PER_BLOCK / sizeof(void *))

14
c/src/libfs/src/imfs/imfs.h
View File

@@ -66,9 +66,21 @@ typedef struct {
* *
* block_ptr is a pointer to a block of IMFS_MEMFILE_BYTES_PER_BLOCK in * block_ptr is a pointer to a block of IMFS_MEMFILE_BYTES_PER_BLOCK in
* length which could be data or a table of pointers to blocks. * length which could be data or a table of pointers to blocks.
*
* Setting IMFS_MEMFILE_BYTES_PER_BLOCK to different values has a significant
* impact on the maximum file size supported as well as the amount of
* memory wasted due to internal file fragmentation. The following
* is a list of maximum file sizes based on various settings
*
* max_filesize with blocks of 16 is 1,328
* max_filesize with blocks of 32 is 18,656
* max_filesize with blocks of 64 is 279,488
* max_filesize with blocks of 128 is 4,329,344
* max_filesize with blocks of 256 is 68,173,568
* max_filesize with blocks of 512 is 1,082,195,456
*/ */
#define IMFS_MEMFILE_BYTES_PER_BLOCK 64 /* 512 */ #define IMFS_MEMFILE_BYTES_PER_BLOCK 128
#define IMFS_MEMFILE_BLOCK_SLOTS \ #define IMFS_MEMFILE_BLOCK_SLOTS \
(IMFS_MEMFILE_BYTES_PER_BLOCK / sizeof(void *)) (IMFS_MEMFILE_BYTES_PER_BLOCK / sizeof(void *))

14
cpukit/libfs/src/imfs/imfs.h
View File

@@ -66,9 +66,21 @@ typedef struct {
* *
* block_ptr is a pointer to a block of IMFS_MEMFILE_BYTES_PER_BLOCK in * block_ptr is a pointer to a block of IMFS_MEMFILE_BYTES_PER_BLOCK in
* length which could be data or a table of pointers to blocks. * length which could be data or a table of pointers to blocks.
*
* Setting IMFS_MEMFILE_BYTES_PER_BLOCK to different values has a significant
* impact on the maximum file size supported as well as the amount of
* memory wasted due to internal file fragmentation. The following
* is a list of maximum file sizes based on various settings
*
* max_filesize with blocks of 16 is 1,328
* max_filesize with blocks of 32 is 18,656
* max_filesize with blocks of 64 is 279,488
* max_filesize with blocks of 128 is 4,329,344
* max_filesize with blocks of 256 is 68,173,568
* max_filesize with blocks of 512 is 1,082,195,456
*/ */
#define IMFS_MEMFILE_BYTES_PER_BLOCK 64 /* 512 */ #define IMFS_MEMFILE_BYTES_PER_BLOCK 128
#define IMFS_MEMFILE_BLOCK_SLOTS \ #define IMFS_MEMFILE_BLOCK_SLOTS \
(IMFS_MEMFILE_BYTES_PER_BLOCK / sizeof(void *)) (IMFS_MEMFILE_BYTES_PER_BLOCK / sizeof(void *))