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23 October 2021, 00:29:24 UTC
Revision f9e35b3b41f47c4e17d8132edbcab305a6aaa4b0 authored by Mel Gorman on 15 June 2011, 22:08:52 UTC, committed by Linus Torvalds on 16 June 2011, 03:04:02 UTC 
mm: compaction: abort compaction if too many pages are isolated and caller is asynchronous V2
 
Asynchronous compaction is used when promoting to huge pages.  This is all
very nice but if there are a number of processes in compacting memory, a
large number of pages can be isolated.  An "asynchronous" process can
stall for long periods of time as a result with a user reporting that
firefox can stall for 10s of seconds.  This patch aborts asynchronous
compaction if too many pages are isolated as it's better to fail a
hugepage promotion than stall a process.

[minchan.kim@gmail.com: return COMPACT_PARTIAL for abort]
Reported-and-tested-by: Ury Stankevich <urykhy@gmail.com>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent d179e84
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Tip revision: f9e35b3b41f47c4e17d8132edbcab305a6aaa4b0 authored by Mel Gorman on 15 June 2011, 22:08:52 UTC
mm: compaction: abort compaction if too many pages are isolated and caller is asynchronous V2
Tip revision: f9e35b3
ripemd.h 
/*
 * Common values for RIPEMD algorithms
 */

#ifndef _CRYPTO_RMD_H
#define _CRYPTO_RMD_H

#define RMD128_DIGEST_SIZE      16
#define RMD128_BLOCK_SIZE       64

#define RMD160_DIGEST_SIZE      20
#define RMD160_BLOCK_SIZE       64

#define RMD256_DIGEST_SIZE      32
#define RMD256_BLOCK_SIZE       64

#define RMD320_DIGEST_SIZE      40
#define RMD320_BLOCK_SIZE       64

/* initial values  */
#define RMD_H0  0x67452301UL
#define RMD_H1  0xefcdab89UL
#define RMD_H2  0x98badcfeUL
#define RMD_H3  0x10325476UL
#define RMD_H4  0xc3d2e1f0UL
#define RMD_H5  0x76543210UL
#define RMD_H6  0xfedcba98UL
#define RMD_H7  0x89abcdefUL
#define RMD_H8  0x01234567UL
#define RMD_H9  0x3c2d1e0fUL

/* constants */
#define RMD_K1  0x00000000UL
#define RMD_K2  0x5a827999UL
#define RMD_K3  0x6ed9eba1UL
#define RMD_K4  0x8f1bbcdcUL
#define RMD_K5  0xa953fd4eUL
#define RMD_K6  0x50a28be6UL
#define RMD_K7  0x5c4dd124UL
#define RMD_K8  0x6d703ef3UL
#define RMD_K9  0x7a6d76e9UL

#endif
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