- 08 Mar, 2005 40 commits
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Prasanna Meda authored
This patch uses find_vma() to improve the read response of /proc/pid/maps. It attempts to make the liner scan instead of quadratic walk and utilise rb tree. Reading the file was doing sequential scan from the begining to file position all the time, and taking a quite long time. The improvements came from f_version/m_version and resulting in mmap_cache match. Even if mmap_cache does not match, rb tree walk should be faster than sequential walk. First attempt was to put the state across read system calls into private data. Later got inspiration from wli's pid patch using f_version in readdir of /proc. Other advantage is, f_version will be cleared automatically by lseek. The test program creates 32K maps and splits them into two(limited by max_map_count sysctl) using mprotect(0). After the patch, the read time improves from many seconds to milliseconds, and does not grow superlinearly with number of read calls. Help taken from Peter Swain in idea and testing. After the patch: Reading /proc/self/maps:65528 time: 0 secs and 780728 usecs buf:4096 bytes:3811362 Reading /proc/self/maps:65528 time: 1 secs and 117573 usecs buf:1024 bytes:3866627 Reading /proc/self/maps:65528 time: 0 secs and 473459 usecs buf: 256 bytes:3866627 Reading /proc/self/maps:65528 time: 0 secs and 901288 usecs buf: 64 bytes:3866627 Reading /proc/self/maps:65528 time: 1 secs and 480185 usecs buf: 16 bytes:3866627 Reading /proc/self/maps:65528 time: 1 secs and 636268 usecs buf: 4 bytes:3866627 Reading /proc/self/maps:65528 time: 4 secs and 118327 usecs buf: 1 bytes:3866627 Before the patch: Reading /proc/self/maps:65528 time: 4 secs and 359556 usecs buf:4096 bytes:3866647 Reading /proc/self/maps:65528 time:16 secs and 218584 usecs buf:1024 bytes:3866688 Reading /proc/self/maps:65528 time:67 secs and 870200 usecs buf: 256 bytes:3866688 Reading /proc/self/maps:65528 time:255 secs and 186934 usecs buf: 64 bytes:3866688 Small reads never completed. Signed-off-by:
Prasanna Meda <pmeda@akamai.com> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Andrew Morton authored
It's possible to define .configs in which there are no references in vmlinux to lib/parser.o. So you cannot load any filesystem modules. Arrange for parser.o to be statically linked. Signed-off-by:
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Matt Mackall authored
Move syncookie code off to networking land. Signed-off-by:
Matt Mackall <mpm@selenic.com> Signed-off-by:
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Matt Mackall authored
Simplify syncookie initialization Refactor syncookie code with separate hash function Signed-off-by:
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Matt Mackall authored
Replace duplicate halfMD4 code with call to lib/ Signed-off-by:
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Matt Mackall authored
Move half-MD4 hash to /lib where we can share it with htree. Signed-off-by:
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Matt Mackall authored
Drop the cryptolib SHA implementation and use the faster and much smaller SHA implementation from lib/. Saves about 5K. This also saves time by doing one memset per update call rather than one per SHA block. Signed-off-by:
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Matt Mackall authored
A replacement SHA routine that's slightly larger, but over twice as fast. It's also faster and much smaller than the cryptolib version. size speed buffer size original: 350B 2.3us 320B cryptolib: 5776B 1.2us 80B this code: 466B 1.0us 320B alternate: 2112B 1.0us 80B Signed-off-by: -
Matt Mackall authored
Move random SHA code to lib/. Signed-off-by:
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Matt Mackall authored
Clean up SHA hash function for moving to lib/ Do proper endian conversion Provide sha_init function Add kerneldoc Signed-off-by:
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Matt Mackall authored
Kill the unrolled SHA variants, they're unused and duplicate code in cryptoapi. Signed-off-by:
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Matt Mackall authored
Move users of private rotl/rotr functions to rol32/ror32. Crypto bits verified with tcrypt. Signed-off-by:
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Matt Mackall authored
Add rol32 and ror32 bitops to bitops.h Signed-off-by:
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Matt Mackall authored
Rather than batching up entropy samples, resulting in longer lock hold times when we actually process the samples, mix in samples immediately. The trickle code should eliminate almost all the additional interrupt-time overhead this would otherwise incur, with or without locking. Signed-off-by:
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Matt Mackall authored
Clean up buffer usage for SHA and reseed. This makes the code more readable and reduces worst-case stack usage. Signed-off-by:
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Matt Mackall authored
Simplify output hash folding Signed-off-by:
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Matt Mackall authored
Remove long-dead md5 code. Signed-off-by:
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Matt Mackall authored
Break apart extract_entropy into kernel and user versions, remove last extract flag and some unnecessary variables. This makes the code more readable and amenable to sparse. Signed-off-by:
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Matt Mackall authored
Put pointer to reseed pool in pool struct and automatically pull entropy from it if it is set. This lets us remove the EXTRACT_SECONDARY flag. Signed-off-by:
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Matt Mackall authored
Move the limit flag to the pool struct, begin process of eliminating extract flags. Signed-off-by:
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Matt Mackall authored
Additional parameter to allow keeping an entropy reserve in the input pool. Groundwork for proper /dev/urandom vs /dev/random starvation prevention. Signed-off-by:
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Matt Mackall authored
When reseeding, we must always do a "catastrophic reseed" where we pull enough new bits to make the new state unguessable from outputs even if we knew the old state. So we must do the checks against the minimum reseed amount under the pool lock in extract_entropy. Signed-off-by:
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Matt Mackall authored
Static initialization for sysctl support Signed-off-by:
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Matt Mackall authored
As we no longer allow resizing of pools, it makes sense to allocate and initialize them statically. Remove create_entropy_store and simplify rand_initialize. Signed-off-by:
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Matt Mackall authored
Give pools more meaningful names. Signed-off-by:
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Matt Mackall authored
Remove incorrectly named ln (it's log2!) and x86 asm function and replace with fls bitop. Signed-off-by:
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Matt Mackall authored
This thinko.. makes things a bit more arbitrary than we'd like. I've re-audited the other rotate conversions. Signed-off-by:
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Matt Mackall authored
We've got three definitions of rotate_left. Remove x86 and duplicate rotate definitions. Remaining definition is fixed up such that recent gcc will generate rol instructions on x86 at least. A later patch will move this to bitops and clean up the other tree users. Signed-off-by:
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Matt Mackall authored
Remove Linux 2.2 compatibility cruft. Signed-off-by:
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Matt Mackall authored
Remove unused extract_timer_state struct. It was formerly used to feedback zero-entropy timing samples while extracting entropy, but that had a tendency to overwhelm the batch processing queue and prevent storing real samples. Signed-off-by:
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Matt Mackall authored
Remove redundant memsets of BSS data Signed-off-by:
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Matt Mackall authored
Simplify the init code Signed-off-by:
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Matt Mackall authored
- Re-init all three pools in ioctls - Clear entropy count in init_std_data under a lock - Add kerneldoc comment Signed-off-by:
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Matt Mackall authored
ZAPENTCNT is now effectively identical to RNDCLEARPOOL, fall through Signed-off-by:
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Matt Mackall authored
Remove pool clearing. We've only ever cleared one of three pools and there's no good reason to do it. Instead just reset the entropy count. Signed-off-by:
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Matt Mackall authored
Original code checked in output pool for missed wakeup avoidance, while waker (batch_entropy_process) checked input pool which could result in a missed wakeup. - Move to wait_event_interruptible style - Delete superfluous waitqueue Signed-off-by:
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Matt Mackall authored
x86_64 wasn't doing anything special in its sort_extable. Use the generic lib/extable sort. Signed-off-by:
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Matt Mackall authored
Switch IA64 exception tables to lib/sort. Signed-off-by:
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Matt Mackall authored
Replace exception table insertion sort with lib/sort Signed-off-by:
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Matt Mackall authored
Point XFS qsort at lib/sort in a way that makes it happy. Signed-off-by:
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