8033931: Several nightly tests failing with assert(imin < imax) failed: Unexpected page size
Summary: cleaned up warnings in linux specific os code.
Reviewed-by: dcubed, hseigel, coleenp, dsamersoff
Contributed-by: gerald.thornbrugh@oracle.com

Summary: Pad and cache-align BiasedMappedArray instances by default to avoid performance variability problems due to false sharing, as instances of this data structures are typically used for performance sensitive code.
Reviewed-by: brutisso, stefank

Summary: Mentioned closures are actually wrapped methods. This adds confusion to readers, and in this case also increases code size as G1ParScanHeapEvacClosure is part of the oop_oop_iterate() methods. Move them into G1ParScanThreadState as methods.
Reviewed-by: stefank

Summary: Refactor the From Card Cache into a separate class.
Reviewed-by: jmasa

Summary: Detailed breakdown of time spent in the evacuation failure handling phases to make the "Other" time roughly correspond to the sum of its parts.
Reviewed-by: jwilhelm, jmasa

Summary: Show the time taken by card redirtying during GC in a new "Redirty Cards" line.
Reviewed-by: jwilhelm, brutisso

Summary: Improve fast card cache iteration and avoid taking locks when freeing the collection set.
Reviewed-by: brutisso

Summary: The from card cache is a very frequently accessed data structure. It is essentially a 2d array of per-region values, one row of values for every GC thread. Pad and align the data structure to avoid false sharing.
Reviewed-by: stefank

Summary: Change the code cache remembered sets data structure from a GrowableArray to a chunked list of nmethods. This makes the data structure more amenable to parallelization, and decreases freeing time.
Reviewed-by: mgerdin, brutisso

Reviewed-by: stefank, mgerdin, coleenp, egahlin

Reviewed-by: stefank, mgerdin

Reviewed-by: jmasa, stefank

Reviewed-by: stefank, mgerdin

Reviewed-by: jmasa, stefank, mgerdin

Summary: Added tests for Min/MaxHeapFreeRatio flags
Reviewed-by: jwilhelm, tschatzl
Contributed-by: andrey.x.zakharov@oracle.com

Reviewed-by: jcoomes

Reviewed-by: dholmes, sla

Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp

Reviewed-by: brutisso, tschatzl

Reviewed-by: brutisso, tschatzl

Reviewed-by: tschatzl, pliden

Summary: verify YMM registers after signal processing and set limit on vector's size.
Reviewed-by: iveresov, twisti

Reviewed-by: tschatzl, pliden

Summary: enable type speculation
Reviewed-by: kvn

Summary: check fr.sender_sp() in java thread instead of os::is_first_C_frame(&fr).
Reviewed-by: twisti, coleenp