aboutsummaryrefslogtreecommitdiffstats
path: root/Documentation/filesystems
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/ext3.txt5
-rw-r--r--Documentation/filesystems/proc.txt28
-rw-r--r--Documentation/filesystems/ubifs.txt9
3 files changed, 32 insertions, 10 deletions
diff --git a/Documentation/filesystems/ext3.txt b/Documentation/filesystems/ext3.txt
index 295f26cd895a..9dd2a3bb2acc 100644
--- a/Documentation/filesystems/ext3.txt
+++ b/Documentation/filesystems/ext3.txt
@@ -96,6 +96,11 @@ errors=remount-ro(*) Remount the filesystem read-only on an error.
96errors=continue Keep going on a filesystem error. 96errors=continue Keep going on a filesystem error.
97errors=panic Panic and halt the machine if an error occurs. 97errors=panic Panic and halt the machine if an error occurs.
98 98
99data_err=ignore(*) Just print an error message if an error occurs
100 in a file data buffer in ordered mode.
101data_err=abort Abort the journal if an error occurs in a file
102 data buffer in ordered mode.
103
99grpid Give objects the same group ID as their creator. 104grpid Give objects the same group ID as their creator.
100bsdgroups 105bsdgroups
101 106
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index c032bf39e8b9..bcceb99b81dd 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -1384,15 +1384,18 @@ causes the kernel to prefer to reclaim dentries and inodes.
1384dirty_background_ratio 1384dirty_background_ratio
1385---------------------- 1385----------------------
1386 1386
1387Contains, as a percentage of total system memory, the number of pages at which 1387Contains, as a percentage of the dirtyable system memory (free pages + mapped
1388the pdflush background writeback daemon will start writing out dirty data. 1388pages + file cache, not including locked pages and HugePages), the number of
1389pages at which the pdflush background writeback daemon will start writing out
1390dirty data.
1389 1391
1390dirty_ratio 1392dirty_ratio
1391----------------- 1393-----------------
1392 1394
1393Contains, as a percentage of total system memory, the number of pages at which 1395Contains, as a percentage of the dirtyable system memory (free pages + mapped
1394a process which is generating disk writes will itself start writing out dirty 1396pages + file cache, not including locked pages and HugePages), the number of
1395data. 1397pages at which a process which is generating disk writes will itself start
1398writing out dirty data.
1396 1399
1397dirty_writeback_centisecs 1400dirty_writeback_centisecs
1398------------------------- 1401-------------------------
@@ -2412,24 +2415,29 @@ will be dumped when the <pid> process is dumped. coredump_filter is a bitmask
2412of memory types. If a bit of the bitmask is set, memory segments of the 2415of memory types. If a bit of the bitmask is set, memory segments of the
2413corresponding memory type are dumped, otherwise they are not dumped. 2416corresponding memory type are dumped, otherwise they are not dumped.
2414 2417
2415The following 4 memory types are supported: 2418The following 7 memory types are supported:
2416 - (bit 0) anonymous private memory 2419 - (bit 0) anonymous private memory
2417 - (bit 1) anonymous shared memory 2420 - (bit 1) anonymous shared memory
2418 - (bit 2) file-backed private memory 2421 - (bit 2) file-backed private memory
2419 - (bit 3) file-backed shared memory 2422 - (bit 3) file-backed shared memory
2420 - (bit 4) ELF header pages in file-backed private memory areas (it is 2423 - (bit 4) ELF header pages in file-backed private memory areas (it is
2421 effective only if the bit 2 is cleared) 2424 effective only if the bit 2 is cleared)
2425 - (bit 5) hugetlb private memory
2426 - (bit 6) hugetlb shared memory
2422 2427
2423 Note that MMIO pages such as frame buffer are never dumped and vDSO pages 2428 Note that MMIO pages such as frame buffer are never dumped and vDSO pages
2424 are always dumped regardless of the bitmask status. 2429 are always dumped regardless of the bitmask status.
2425 2430
2426Default value of coredump_filter is 0x3; this means all anonymous memory 2431 Note bit 0-4 doesn't effect any hugetlb memory. hugetlb memory are only
2427segments are dumped. 2432 effected by bit 5-6.
2433
2434Default value of coredump_filter is 0x23; this means all anonymous memory
2435segments and hugetlb private memory are dumped.
2428 2436
2429If you don't want to dump all shared memory segments attached to pid 1234, 2437If you don't want to dump all shared memory segments attached to pid 1234,
2430write 1 to the process's proc file. 2438write 0x21 to the process's proc file.
2431 2439
2432 $ echo 0x1 > /proc/1234/coredump_filter 2440 $ echo 0x21 > /proc/1234/coredump_filter
2433 2441
2434When a new process is created, the process inherits the bitmask status from its 2442When a new process is created, the process inherits the bitmask status from its
2435parent. It is useful to set up coredump_filter before the program runs. 2443parent. It is useful to set up coredump_filter before the program runs.
diff --git a/Documentation/filesystems/ubifs.txt b/Documentation/filesystems/ubifs.txt
index 6a0d70a22f05..dd84ea3c10da 100644
--- a/Documentation/filesystems/ubifs.txt
+++ b/Documentation/filesystems/ubifs.txt
@@ -86,6 +86,15 @@ norm_unmount (*) commit on unmount; the journal is committed
86fast_unmount do not commit on unmount; this option makes 86fast_unmount do not commit on unmount; this option makes
87 unmount faster, but the next mount slower 87 unmount faster, but the next mount slower
88 because of the need to replay the journal. 88 because of the need to replay the journal.
89bulk_read read more in one go to take advantage of flash
90 media that read faster sequentially
91no_bulk_read (*) do not bulk-read
92no_chk_data_crc skip checking of CRCs on data nodes in order to
93 improve read performance. Use this option only
94 if the flash media is highly reliable. The effect
95 of this option is that corruption of the contents
96 of a file can go unnoticed.
97chk_data_crc (*) do not skip checking CRCs on data nodes
89 98
90 99
91Quick usage instructions 100Quick usage instructions