Merge branch 'tcp_mmap-optmizations' - linux-dev - Linux kernel development work

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author	David S. Miller <davem@davemloft.net>	2020-08-20 16:14:54 -0700
committer	David S. Miller <davem@davemloft.net>	2020-08-20 16:14:54 -0700
commit	e6e67768a0b9d6e31ef0bfe94f24659d0e6941f1 (patch)
tree	3f43cd2e8b31e71ea928e603bf87a27c0da90797 /tools/perf/scripts/python/flamegraph.py
parent	net: zerocopy: combine pages in zerocopy_sg_from_iter() (diff)
parent	selftests: net: tcp_mmap: Use huge pages in receive path (diff)

Merge branch 'tcp_mmap-optmizations'

Eric Dumazet says: ==================== tcp_mmap: optmizations This series updates tcp_mmap reference tool to use best pratices. First patch is using madvise(MADV_DONTNEED) to decrease pressure on the socket lock. Last patches try to use huge pages when available. ==================== Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Arjun Roy <arjunroy@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>

Diffstat (limited to 'tools/perf/scripts/python/flamegraph.py')

0 files changed, 0 insertions, 0 deletions

/* elision-lock.c: Elided pthread mutex lock. Copyright (C) 2011-2013 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <pthread.h> #include "pthreadP.h" #include "lowlevellock.h" #include "hle.h" #include <elision-conf.h> #if !defined(LLL_LOCK) && !defined(EXTRAARG) /* Make sure the configuration code is always linked in for static libraries. */ #include "elision-conf.c" #endif #ifndef EXTRAARG #define EXTRAARG #endif #ifndef LLL_LOCK #define LLL_LOCK(a,b) lll_lock(a,b), 0 #endif #define aconf __elision_aconf /* Adaptive lock using transactions. By default the lock region is run as a transaction, and when it aborts or the lock is busy the lock adapts itself. */ int __lll_lock_elision (int *futex, short *adapt_count, EXTRAARG int private) { if (*adapt_count <= 0) { unsigned status; int try_xbegin; for (try_xbegin = aconf.retry_try_xbegin; try_xbegin > 0; try_xbegin--) { if ((status = _xbegin()) == _XBEGIN_STARTED) { if (*futex == 0) return 0; /* Lock was busy. Fall back to normal locking. Could also _xend here but xabort with 0xff code is more visible in the profiler. */ _xabort (_ABORT_LOCK_BUSY); } if (!(status & _XABORT_RETRY)) { if ((status & _XABORT_EXPLICIT) && _XABORT_CODE (status) == _ABORT_LOCK_BUSY) { /* Right now we skip here. Better would be to wait a bit and retry. This likely needs some spinning. */ if (*adapt_count != aconf.skip_lock_busy) *adapt_count = aconf.skip_lock_busy; } /* Internal abort. There is no chance for retry. Use the normal locking and next time use lock. Be careful to avoid writing to the lock. */ else if (*adapt_count != aconf.skip_lock_internal_abort) *adapt_count = aconf.skip_lock_internal_abort; break; } } } else { /* Use a normal lock until the threshold counter runs out. Lost updates possible. */ (*adapt_count)--; } /* Use a normal lock here. */ return LLL_LOCK ((*futex), private); }


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